This commit adds Keystone audit middleware API logging to the Cinder
charm in versions Yoga and newer to allow users to configure their
environment for CADF compliance. This feature can be enabled/disabled
and is set to 'disabled' by default to avoid bloat in log files.
The logging output is configured to /var/log/apache2/cinder_error.log.
This commit builds on previous discussions:
https://github.com/juju/charm-helpers/pull/808.
Related-Pr: https://github.com/juju/charm-helpers/pull/893
func-test-pr: https://github.com/openstack-charmers/zaza-openstack-tests/pull/1200
Closes-Bug: 1856555
Change-Id: Ia7dbd6af2305e92eaa9a65890644c4a324ab2c65
e25b5d38fb