ctdb-takeover: Send banning credit messages from fail callback

ctdb-takeover: Send banning credit messages from fail callback

Banning credits are now assigned by takeover runs called from all
locations in the recovery daemon.  Previously this only happened from
one of the callers.  When separating out the takeover run code the
behaviour should be consistent.

The callback (and corresponding data) passed to ctdb_takeover_run() is
now ignored.  Dropping this will allow the interface between the
recovery daemon and IP takeover to be simplified.

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