Terry Wilson bb11a307c0 Add lock acquire/lost callbacks

It is common for workers to obtain an OVSDB lock to keep multiple
workers from doing maintenance tasks, like reconciling MySQL and
OVN DBs. If a worker attempts to do a reconcile at startup and
check's has_lock, it is possible that a stale lock from a previous
worker will cause it to skip its task.
Adding callbacks that fire on lock acquisition/loss resolves this
issue. In addition, there was a bug with wait_for_change where a
set_lock() call made before Connection.start() would cause
wait_for_change to return before the initial OVSDB DB dump, which
could allow operations on an empty DB. This is fixed by only
returning while in the MONITORING state.
Change-Id: Ic120b547ed31987cafc10c5c5f37f729349f2be1
Signed-off-by: Terry Wilson <twilson@redhat.com>
Assisted-by: Claude Opus 4.6

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