ctdb-recoverd: Improve error messages on recovery lock coherence fail

ctdb-recoverd: Improve error messages on recovery lock coherence fail

When the daemon is able to take the recovery lock during recovery we
might as well guess that the cluster filesystem has a lock coherence
problem and print a more useful message.  This will be more helpful to
those trying out cluster filesystems that don't have lock coherence or
that are difficult to setup.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>