MAR-218: Force handler execution during testing for consistency:

- Otherwise it can easily happen that some handlers never run, leaving
the machine in inconsistent state until they are run by hand.

MAR-218: Drop linting definitions from Molecule configuratin files:

- Molecule no longer natively supports running linters.
- Disable the Ansible Galaxy dependency installation (none of the
roles utilise this).

MAR-239: Dropped support for Debian 11 Bullseye from the ldap_server role:

- Debian 12 Bookworm and upwards no longer install/configure rsyslog
by default, drop the related tests, tasks, and configuration files.

MAR-189: Disable use of KVM paravirtualisation provider with Vagrant/VirtualBox:

- The VMs seem to randomly hang when the (KVM) clock source gets
initialised right after getting past the bootloader. Helps run the
tests in a way more reliable way.
- Should be removed if upgrading to latest kernel/VirtualBox versions
helps.

MAR-189: Refactored admin acocunt handling in the ldap_server role:

- Get rid of the admin entry from the directory, and resort to using
the directory's olcRootDN/olcRootPW attributes instead. Aligns
Buster package deployment with Bullseye one, as implemented via fix
for the following Debian bug:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=821331

- Add the helper filter plugin to deal with calculating the salted
SHA1 checksum.
- Drop the architecture from Molecule instance names.
- Move the IPs around a tiny bit for Molecule instances.

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

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

MAR-161: Make the ldap_server_domain parameter in the ldap_server role mandatory:

- Updated the ldap_server role.
- Removed default value for the parameter.
- Updated tests.
- Updated role reference documentation.
- Updated release notes.
- Dropped the .local from the Molecule instance names.

MAR-150: Use fixtures for X.509 artefacts in the ldap_server role:

- Removed the statically generated artefacts.
- Generate X.509 artefacts for tests using Gimmecert.
- Updated paths to point to generated artefacts.
- Introduced cleanup playbook for removing generated artefacts.

MAR-148: Disable Ansible's default of enforcing group names without dashes through Molecule configuration files:

The following links might be a useful read:

- https://github.com/ansible/ansible/issues/56930 (issues relaetd to
lack of docs, but many complaints and explanations within)
- https://groups.google.com/forum/#!topic/ansible-devel/bjAcM9ferIw

MAR-132: Add support for Debian 9 (Stretch) to ldap_server role:

- Updated Molecule tests to cover Debian 9 as well.
- Remove the ss utility instead of renaming it when preparing for
tests, and make sure the netstat utility is available.
- Duplicate private key/certificate for mandatory parameters testing.

MAR-129: Updated ldap_server role for new Molecule and Ansible:

- Fixed syntax warnings.
- Moved test playbook variables into group_vars.
- Optimised the invocation of test playbook.
- Remove the 'ss' utility from test machines in order to properly test
the unix sockets.
- Fixed how the hosts are being referenced in tests.

MAR-128: Upgraded tests for ldap_server role:

- Switch to new Molecule configuration.
- Updated set-up playbook to use become: yes.
- Moved some preparatory steps outside of the main playbook (eases
idempotence tests).
- Updated tests to reference the yml inventory file.
- Updated tests to use new fixture (host instead of individual ones).
- Fixed some linting issues.
- Use localhost as backup client server name. This should make it
simpler in future to cover more platforms.
- Set-up the /etc/hosts for tests with correct entries (primarily
aliases towards localhost to make it less important what the
hostname is).
- Renamed private key/certificate files for parameters-mandatory
server since server got renamed as well.
- Updated IP addresses used for testing to make it easier to test new
platforms in the future.
- Use inventory_hostname-based parameterisation of tests where
appropriate. Currently hard-coded value for this because
host.ansible.get_variables() produces errors.