MAR-181: Drop support for Debian 9 Stretch from php_website role:

- Keep the mail alias step - it is still relevant for Debian Buster.

MAR-181: Drop support for Debian 9 Stretch from web_server role:

- Switch to using IPs from VirtualBox default allowed host-only
network subnets.
- Drop Stretch-specific code and tests.

MAR-181: Increase memory for mail_server role test machines:

- ClamAV eats-up quite a bit of memory, and 1536MB is not enough. Most
likely the memory usage will grow over time as the anti-virus
database grows since it is loaded up into memory.

MAR-181: Drop support for Debian 9 Stretch from mail_server role:

- Switch to using IPs from VirtualBox default allowed host-only
network subnets.
- Use Debian Buster for helper machines.
- Drop Stretch-specific code and tests.

MAR-181: Drop support Debian 9 Stretch from mail_forwarder role:

- Switch to using IPs from VirtualBox default allowed host-only
network subnets.
- Use Debian Buster for helper machines.

MAR-181: Remove release-specific code for database role tests:

- Code was present due to difference between Debian Stretch and Debian
Buster.

MAR-181: Drop support for Debian 9 Stretch from ldap_server role:

- Switch to using IPs from VirtualBox default allowed host-only
network subnets.
- Drop the workaround for unsupported TLS ciphers on Debian Stretch.

MAR-181: Drop support for Debian 9 Stretch from database role:

- Bump VM memory to 512MB (otherwise MariaDB fails to start up).

MAR-181: Drop support for Debian 9 Stretch from the backup_server role:

- Switch to using IPs from VirtualBox default allowed host-only
network subnets.

MAR-181: Drop support for Debian 9 Stretch from the backup_client role:

- Provide more details on use of pexpect+sftp backed for
Duplicity (backend has to be used on Debian 10 Buster as well, not
just Debian 9 Stretch).
- Switch to using IPs from VirtualBox default allowed host-only
network subnets.

MAR-181: Dropp support for Debian 9 Stretch from the common role:

- Drop platform name from all helper VMs.
- Switch to using IPs from VirtualBox default allowed host-only
network subnets.

MAR-165: Deploy Diffie-Helman parameters for LDAP server in the ldap_server role:

- Not relevant for Debian Strech because of a bug in the OpenLDAP
version it ships with.
- This should allow use of DHE ciphers with LDAP server.
- Generated DH parameters only help pick one of the parameters from
RFC-7919 (based on the size of generated ones).
- Make the cipher test lists distro-specific due to differences
between supported algorithms in respective GnuTLS versions.

MAR-151: Drop rcconf workaround:

- The workaround was needed on Debian Jessie because the systemctl
is-enabled command did not behave correctly for SysV init scripts.
- Drop the installation of the rcconf package.
- Use the "enabled" parameter in service module instead.

MAR-151: Fix The Bug Genie backup example in usage instructions:

- Properly set-up the directory where files are uplaoded.
- Update instructions to mention what needs to be done in order to
upload some files in The Bug Genie.

MAR-151: Fix authentication issues for backup client in usage instructions:

- Add warning about how Ansible file lookup can mess with trailing
newlines.
- Disable stripping of newlines when reading the backup client SSH
private key.

MAR-151: Specify the wsgi_requirements_in file in the sample WSGI application in usage instructions:

- Primarily because futures is not required when using Python 3.

MAR-151: Update usage instructions for setting-up PHP web application (The Bug Genie):

- Updated The Bug Genie to version 4.3.1.
- Updated version of Composer used. Stay away from version 2.x due to
idempotency problems in Ansible module (see
https://github.com/ansible-collections/community.general/issues/1179).
- Fix required version for lib-pcre since Debian Buster links agains
lib-pcre 10. This should still work fine.
- Instead of listing plaintext web URLs, list just the HTTPS ones.

MAR-151: Switch to Debian 10 Buster in usage instructions:

- Specify that Debian Buster should be used instead of Debian Stretch.
- Switch to using https links where possible.
- Minor fixes to wording/instructions.
- Updated link towards Debian Buster preseed documentation appendix.
- Use Python 3 when serving the preseed files.
- Fixed DNS subject alternative name for the XMPP server (it should be
the domain served by the XMPP server, not its canonical FQDN).
- Added small note for database_server role and how it sets-up root
account authentication, and update instructions for logging-in into
database server as root.

MAR-151: Update/fix test site wsgihello2 role:

- Include six as dependency for ipcalc (bug in packaging of ipcalc).
- Updated requirements for the application.
- Specify the wsgi_requirements_in parameter, and update the
wsgi_requirements parameter.

MAR-151: Minor fix for wsgi_website role reference documentation:

- List paths for both Python 2 and Python 3 pip requirements upgrade
check directories.

MAR-151: Switch to using PyMySQL module for database and database_server role:

- Explicitly specify the path to MariaDB unix socket to enforce unix
socket authentication.

MAR-151: Added support for Debian 10 Buster to xmpp_server role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Enable lower-level TLS protocols (1.0/1.1) in global OpenSSL
configuration file on Buster in order to be able to test the
xmpp_server_tls_protocol parameter (otherwise Prosody completely
refuses to use them even if listed in its configuration).
- Move stretch-specific tests into its own file (for backported
lua-ldap library), and run them on Debian 9 Stretch machines only.

MAR-151: Added support for Debian 10 Buster to wsgi_website role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Replace the installation of libmariadbclient-dev-compat library with
atftp - the actual package is differently named under Debian Stretch
and Debian Buster (which would complicate the test without any
benefits).
- Drop the fix for root mail alias in Vagrant image - seems it's no
longer a problem.
- Split-up the test for web application user since it's not possible
to keep it all under one parametrised test due to differences in
assigned system UID numbers for Debian Stretch and Debian Buster.
- Make the test for web application user less dependant on what the
actual UID number is in case of default value. By default user
should be created as system user, which means its UID number should
be less than 1000.

MAR-151: Added support for Debian 10 Buster to php_website role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Refactor the code to take into account differences in PHP-related
paths between Debian Stretch and Debian Buster.
- Make the test for web application user less dependant on what the
actual UID number is in case of default value. By default user
should be created as system user, which means its UID number should
be less than 1000.
- Drop the installation of libmariadbclient-dev-compat library - the
test is good enough without it, and the actual package is
differently named under Debian Stretch and Debian Buster (which
would complicate the test without any benefits).

MAR-151: Added support for Debian 10 Buster to web_server role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Refactor the code around handling of different directories and files
for PHP 7.0 (Debian Stretch) and PHP 7.3 (Debian Buster).
- Separate socket directory tests for WSGI and PHP applications (due
to differences in paths for PHP in Debian Stretch and Debian
Buster).

MAR-151: Added support for Debian 10 Buster to preseed role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Parametrise distribution release in one of the tests to cover both
servers with custom overrides being tested.

MAR-151: Use 2048-bit DH parameter for IMAP server under Debian 10 Buster:

- Deploy a statically-generated DH parameter.
- Set-up DH parameter configuration based on Debian version.
- Implemented test for newly-generated file.

MAR-151: Fix tests that fail due to differences between Debian Stretch and Debian Buster:

- Update the regex patterns used to locate deliveries via Dovecot.
- Enable verbose mode for gnutls-cli in one of the tests in order to
show the DH key size.
- Update the list of expected TLS ciphers for SMTP port 25 to account
for inclusion of additional ciphers in Debian Buster.
- Fix how the allowed relay IP is being fetched, because
host.ansible.get_variables method fails to resolve dynamic
variables.

MAR-151: Added support for Debian 10 Buster to mail_server role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Improve handling of configured IP in tests to avoid hard-coding the
value in the relevant test for Postfix configuration file content.

MAR-151: Added support for Debian 10 Buster to mail_forwarder role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Set the smtpd_relay_restrictions configuration option for Postfix
SMTP server in mail_forwarder role (required for version found in
Debian 10 Buster).

MAR-151: Added support for Debian 10 Buster to ldap_server role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.

MAR-151: Added support for Debian 10 Buster to ldap_client role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.

MAR-151: Added support for Debian 10 Buster to database role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Fix test that produces different outputs during invocation on
Stretch/Buster.

MAR-151: Added support for Debian 10 Buster to database_server role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.
- Deploy MariaDB client login configuration prior to setting-up
users/passwords for deprecated feature testing to avoid errors when
password gets changed in the middle of a task loop.

MAR-151: Added support for Debian 10 Buster to bootstrap role:

- Updated role reference documentaiton.
- Updated role meta information.
- Updated tests.

MAR-151: Added support for Debian 10 Buster to backup_server role:

- Updated role reference documentation.
- Updated role meta information.
- Updated tests.
- Do not use distribution version-specific SSH configuration file for
backup server SSH daemon.

MAR-151: Added support for Debian 10 Buster to common role:

- Updated tests.
- Updated role reference documentation.
- Updated role metadata information.
- Refactored IP plan for the test machines for better separation
between different types of machines and versions.
- Parametrised tests for limited connectivity using the maintenance
mode.
- Don't use MariaDB compat package in tests - name differs between
Debian 9 and Debian 10, and relevant parameter is already getting
tested properly using the remaining packages.

MAR-151: Added support for Debian 10 Buster to backup role:

- Updated tests.
- Updated role reference documentation.

MAR-151: Added support for Debian 10 Buster to backup_client role:

- Updated tests.
- Refactored one of the test to determine hostname dynamically.
- Update role reference documentation.

MAR-163: Ensure host.run is not suspectible to shell injection:

- Use host.run's built-in capability for handling parameter escaping
and insertion.

MAR-163: Attach noqa directives to task names (if skipping is applicable on task level) for better uniformity:

- This way the indentation of comment describing the directive can
always be on the same level everywhere (irrespective of how the rest
of task arguments are listed).

MAR-163: Reformat multiple skip-QA directives and remove some unnecessary ones:

- Update codes used to identify the disabled QA checks.
- Switch to using new syntax that disables only a specific QA check
instead of all of them on a single task.
- Drop disabling QA checks related to octal file permissions (this was
most likely bug in older versions of ansible-lint).

MAR-163: Reformat skip-QA directives for ANSIBLE0012 (Commands should not change things if nothing needs doing):

- Update codes used to identify the disabled QA checks.
- Switch to using new syntax that disables only a specific QA check
instead of all of them on a single task.
- Drop disabling QA checks on two command tasks, since they actually
use the "creates" directive (therefore passing the QA check).

MAR-163: Deduplicate tests for the preseed directory in preseed role:

- Run a single test on all three servers.
- Explicitly specify the preseed directory path (instead of using
constant).

MAR-163: Refactor the connectivity test in mail_server role:

- Parametrise the test instead of looping within. Should help getting
cleaner error messages on what port has failed while also running
the test for every combination.
- Use safer way to pass arguments to host.run invocation.

MAR-163: Refactor the test_imap_authentication_requires_tls test:

- Parametrise the tests.
- Reduce code duplication.
- Make the host.run invocation slightly safer (currently it does not
matter, but it looks nicer this way).

MAR-163: Deduplicate test for certificate validity check configuration in mail_server role:

- Tests are already identical, they were probably kept separate by
mistake.

MAR-163: Deduplicate tests in the bootstrap role:

- The two tests are now identical due to ansible_key parameter now
being mandatory.

MAR-160: Update release notes, usage instructions, and role reference documentation:

- Describe the maintenance and maintenance_allowed_hosts parameters
for the common role.

MAR-160: Added maintenance and maintenance_allowed_hosts parameters to common role:

- Lets the user specify list of hosts for which the incoming
connections should be allowed.
- Defaults are not to limit connectivity.
- Implemented the necessary tests.
- Set-up the base ferm/firewall rules if maintenance mode is enabled.

MAR-160: Minor fixes while preparing the machines:

- Use the correct path for initialised CA hierarchy.
- Remove the ss utility instead of renaming it in order to avoid
issues when rerunning the prepare step during testing.

MAR-180: Do not pin pip/setuptools to specific versions when setting up Python virtual environment:

- Provided more details for the pkg-resources workaround.
- Skip installing latest version of pip - it will get installed
automatically via the virtualenv command already.
- Do not pin the setuptools package when installing.
- Updated release notes.

MAR-177: Do not pin pip/setuptools to specific versions when setting up Python virtual environment:

- Provided more details for the pkg-resources workaround.
- Skip installing latest version of pip - it will get installed
automatically via the virtualenv command already.
- Do not pin the setuptools package when installing.
- Updated release notes.

MAR-168: Minor fixes for the debian_server role:

- Drop the workaround for enabling the mysql service (Debian Stretch
and upwards use pure systemd unit file).
- Improved name of one of the tasks.

MAR-168: Drop the Debian system maintenance user if present:

- Drop the user itself from the MySQL database.
- Update the Debian system maintenance configuration file if root is
not specified as the user within.
- Updated tests.
- Updated release notes.
- Updated role reference documentation.

MAR-168: Clean-up references to database_server root password:

- Updated role reference documentation.
- Updated usage instructions.
- Updated test configurations.
- Remvoed unused files/variables.
- Updated test site configuration.

MAR-168: Drop the user of passwords for the root MySQL account:

- Rely on unix_socket authentication plugin instead.
- Updated role reference documentation.
- Updated tests.

MAR-168: Introduce additional machine in database_server tests for testing deprecated features:

- Updated Molecule configuration, defining an additional machine.
- Set-up the new machine with pre-installed MariaDB server instance,
root login with password, and separate Debian system maintenance
user.
- Set-up configuration files for root and Debian system maintenance
user login.
- Run the default set of tests on the deprecated machine group.

MAR-175: Mail server should be opportunistic in using TLS when delivering mail to remove servers:

- Previously the mail server would only deliver mails over plaintext.
- Deploy a simple SMTP server on both client1/client2
machines. Servers are set-up to require/refuse the STARTTLS over
SMTP.
- Added tests for checking if STARTTLS is used when available for mail
delivery.
- Fixed the wrong configurtion (making sure the TLS security level is
properly set for Postfix).

MAR-175: Update Postfix configuration, merging changes from Debian Buster stock installation and latest ISPmail tutorials:

- Added commented-out section for TLS parameters from Debian Buster
default configuration. This should slightly help with handling the
diff's in the future.
- Added a number of "missing" configuration parameters from the Debian
Buster stock configuration.
- Separate relay-related restrictions from spam-related restrictions.
- Updated configuration for RBLs.
- Updated default service definitions in the master.cf configuration
to be in-line with options defined in Debian Buster. This is
primarily revolving around the change to the chroot
option. Previously the default was to chroot the processes, while
new default is not to do so. This required marking a number of
services to be explicitly chroot'ed.
- Updated the submission service definition in master.cf configuration
file. Some minor changes were made, like switching to using the
smtpd_relay_restrictions instead of
smtpd_recipient_restrictions (better suited configuration option for
this use-case since it's not spam-related), being more explicit
around TLS being required for authentication.

MAR-174: Enable Message Carbons (XEP-0280) and Message Archive Management (XEP-0313) via xmpp_server role:

- Updated release notes.
- Updated role reference documentation.
- Enable the two modules via Prosody configuration file, and set the
archive expiration configuration option for Prosody.
- Updated tests.

MAR-164: Fix Prosody TLS configuration in xmpp_server role:

- Added warning to role reference documentation about what DNS names
need to be included in the subject alternative name of issued
certificate used for Prosody.
- Added crontab with script that validates the certificate on daily
basis.
- Updated tests to include the proxy.DOMAIN and conference.DOMAIN DNS
names in subject alternative name for generated test certificates.
- Added and updated tests that cover new functionality.
- Fixed the Prosody TLS configuration to have common parameters
specified in general section, and any kind of overrides (mainly the
ciphers) in more specific sections.
- Updated release notes.