OctaviaLogOffload is a feature that collects Octavia Amphora logs in a
rsyslog service. It makes sense to enable it by default in all
deployments, it provides useful logs for CI jobs and for end users.
Depends-On: https://review.opendev.org/798066
Change-Id: Ibee40113ec7cb9f65f6503a36e8d3ed40d3fbf4c