MDSMonitor: be more conservative with use of pending_mdsmap.
MDSMonitor: be more conservative with use of pending_mdsmap.

Use the current mdsmap when looking for MDSes to standby-replay for,
as that way we know the other MDS is already up. Otherwise we could
try and come up together and potentially race.

Signed-off-by: Greg Farnum <0bcb4295d38ee745130ea5f2bb88ef4eef474e61@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph