s3:cleanupd: sends MSG_SMB_UNLOCK twice to interested peers

s3:cleanupd: sends MSG_SMB_UNLOCK twice to interested peers

MSG_SMB_UNLOCK should be send to smbd that are waiting on blocked
byte-range-locks when a lock holder died.

In smbd_cleanupd_unlock() we do this twice: once via a broadcast and
then again via brl_revalidate() to processes that are actually recorded
in brlock.tdb.

As brl_revalidate() should already take care of signaling anyone who
would be interested in the message, there's no need to broadcast.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=13416

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Fri May  4 03:02:28 CEST 2018 on sn-devel-144