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.
Closes-Bug: 1856555
Change-Id: Ia7dbd6af2305e92eaa9a65890644c4a324ab2c65
(cherry picked from commit e25b5d38fbb0692e5fab6e7f562c974316d61abe)
0b1667a383