ctdb-takeover: Use the takeover_run_fail_callback() in more cases

ctdb-takeover: Use the takeover_run_fail_callback() in more cases

Probably due to oversight, this is currently only used for the
"takeip" step.

This does consistent error handling and provides a layer of
indirection to the passed callback, so use it for "releaseip" and
"ipreallocated" steps too.

The callback data now needs to be initialised before the first
possible jump to "ipreallocated".

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