[v3.30] OpenStack: make periodic compaction loop independent of resync

[nelljerram]

Cherry-pick history

• Pick onto release-v3.30: projectcalico/calico#11306 We need to make the compaction and resync loops independent for two reasons.

1. If resync is enabled and takes a very long time (multiple hours), we don't want that to block us from regularly requesting compaction.

2. If resync is disabled, by resync_interval_secs being set to 0, we still want to request compaction periodically.

3. The help text for etcd_compaction_period_mins says "Interval in minutes between periodic etcd compactions." So we should actually implement that! Currently the actual interval is resync_interval_secs plus however long a resync cycle takes.

Release Note

OpenStack bugfix: request etcd compaction periodically regardless of how long resync takes, or if periodic resync is disabled.