ctdb-daemon: Always update database priority cluster wide

Database priority is a global property and all the nodes should have the
priority set for the databases.  Just setting priority on one node can
lead to problems in the recovery as a database can be frozen at wrong
priority and then freezing database would not succeed.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: David Disseldorp <ddiss@samba.org>

Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Mon Apr  7 14:06:26 CEST 2014 on sn-devel-104