MAR-226: Harmonise the HTTP header override parameter between the PHP and WSGI website roles:

- Use the new naming/syntax introduced in the php_website role since
it implies less dependence on the backend application (more generic
name for it), and is a little bit saner in terms of not having to
provide quotes as part of the value.

MAR-192: Added support for Debian 12 Bookworm to wsgi_website role:

- Update list of Python packages that are installed for running the
tests.
- Paramterise Python version testing (depends on distribution
release). Use similar construct like for the php_website role.

MAR-154: Drop suppor for Python 2.7 from the wsgi_website role:

- Mostly a matter of dropping the Python version parameter, and
updating some package versioning to account for Python 3 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-170: Always enforce use of HTTPS in the wsgi_server role:

- Dropped the enforce_https parameter.
- Updated tests.
- Updated release notes.

MAR-159: Added wsgi_requirements_in parameter to wsgi_website role:

- Added the parameter as optional.
- Updated role reference documentation.
- Updated release notes.
- Updated tests.

MAR-159: Set-up defaults for wsgi_requirements and update tests:

- Set defaults for the wsgi_requirements parameter (for running using
Python 2).
- Drop the use of futures_version and gunicorn_version from the
Molecule tests.
- Updated and deduplicated tests related to testing of
installed/requested futures and gunicorn package versions.

MAR-150: Use fixtures for X.509 artefacts in the wsgi_website 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-162: Make the https_tls_certificate and https_tls_key parameters mandatory in wsgi_website role:

- Dropped the defaults from wsgi_server role.
- Updated group variables in role tests.
- Changed the key/certificate file extensions to be more descriptive.
- Updated role reference documentation.
- Updated usage instructions to include the mandatory parameters.

MAR-132: Pin packages as part of wsgi_website role test to ensure reproducability:

- Provide explicit list of packages being deployed. This should ensure
we can always reproduce the tests without being affected by new
releases of packages.
- Updated expected requirements in test for the jedi version.

MAR-132: Added support for Debian 9 (Stretch) to wsgi_website role:

- Set the shell for application system account explicitly (workaround
for Debian bug 865762 in Stretch).
- Updated Molecule tests to cover Debian 9.
- Updated Molecule test preparation playbook to account for a number
of differences between Jessie and Stretch (mainly related to mailing
functionality).
- Renamed a couple of variables in test for sending out mails to make
it clearer what is being looked up as part of regex matching.
- Updated Molecule tests where certain paths depend on what Debian
release they are ran against.
- Split-up Jessie-specific tests into separate file.
- Remove the /bin/ss utility instead of renaming it (testinfra socket
tests do not work with /bin/ss).

MAR-131: Added support for specifying Python version in wsgi_website role:

- Introduced additional role parameter for specifying the Python
version.
- Updated tests to verify new functionality.
- Fixed existing tests to account for differences between Python 2 and
Python 3 - including changes to WSGI test applications.
- Updated documentation, documenting new parameter and fixing one
minor typo.
- Updated release notes.
- Bumped default version of Gunicorn/futures used.

MAR-129: Updated wsgi_website role for Ansible 2.5.x and new Molecule:

- Include top-level linting configuration in test configuration file.
- Fixed linting errors.
- Updated Ansible deprecation warnings related to use of
state=installed with apt module.
- Updated how hosts are being referenced in tests.
- Rename the 'ss' utility in order to properly test socket
connectivity as a workaround for Testinfra bug.

MAR-128: Upgraded tests for ROLE_NAME 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).
- Switched to extracting hostname instead of hard-coding it in a
couple of tests.
- Fixed some linting issues.
- Updated one of the tests that depend on output of pip freeze due to
new versions of packages coming out.
- Updated hostname to include Debian version (for future expansion).
- Renamded some test data to match new hostname.