This commit adds Keystone audit middleware API logging to the Nova-
Cloud-Contoller 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 writes to
/var/log/nova/nova-api-wsgi.log.
This commit builds on previous discussions:
https://github.com/juju/charm-helpers/pull/808.
Closes-Bug: 1856555
Change-Id: Ie09cc6775c13a2dba6a0f3d69a4a080f9fc484c8
(cherry picked from commit 723515fd2b)
5530033c32