early return for _share_replica_update() if there is no active replica
early return for _share_replica_update() if there is no active replica

If the parent share of the replica has no active replica,
this is an error situation where _share_replica_update() simply
returns and logs a warning if the replica being acted on has not
been already in error state itself before.

Change-Id: I9bdbbaafba413fa4b2a783130fd58a4b6c2cea4b
Partial-Bug: #1924230

openstack/manila,openstack/manila