MAR-148: Fixing linting errors:

- Do not compare against booleans when value is already boolean in
"when" conditions.
- Use pipefail in conjunction with setting the shell to Bash when
extracting the backup encryption key IDs.
- Do not compare variables to empty strings in "when" conditions. This
change currently works only for complex variables (stuff can break
badly in case of simple variables in current default Ansible
configuration).
- Fix missing space in one of Jinja2 templates.

MAR-135: Switch to using run_handlers instead of handlers as variable:

- Updated all roles to now depend on run_handlers being set to True in
order to force execution of handlers.

MAR-129: Minor fixes after initial testsite run:

- Fix conditional for running handlers in the bootstrap role.
- Add dummy handlers that will suppress Ansible warnings about empty
handler includes.

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

- Include top-level lint configuration file.
- Fixed linting errors.
- Moved test playbook parameters into group_vars.
- Fixed Ansible deprecation warnings.
- Updated how the hosts are referenced in tests.

MAR-114: Updated task syntax for bootstrap, preseed and xmpp roles:

- Updated web_server, php_website, and wsgi_website roles.
- Added and removed quoting where it makes sense.
- Switched to using expanded syntax (instead of one-liners).
- Updated ordering of arguments in task definitions.

MAR-21: Implemented tests for the bootstrap role:

- Use plain spaces in sudo configuration to make it easier to test.
- Added testing for both Debian Stretch and Debian Jessie.
- Fixed Ansible liniting for file mode.
- Implemented a couple of basic tests.