Only create downtimes from non-paused ScheduledDowntime objects in HA enabled cluster zones #6820
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From a discussion with @Al2Klimov we came to the conclusion that
a ScheduledDowntime "does something" in HA enabled cluster zones,
similar to Checkable and Notification objects. As such, they can
be balanced.
Since we already have the HA & UpdateObjectAuthority functionality
available, we just need to ensure that only the active SD object
calls
CreateNextDowntime()
thus leaving the paused SD object"doing nothing".
That way generated downtimes from SD objects only happen once,
and the cluster syncs just that one downtime to both nodes.
No more duplicates, tests attached.
fixes #2844