ctdb-scripts: Drop functions ctdb_checkstatus() and ctdb_setstatus()

ctdb-scripts: Drop functions ctdb_checkstatus() and ctdb_setstatus()

They're not used outside of ctdb_standard_event_helper().

As a consequence, make ctdb_standard_event_helper() do nothing.  It is
harder to remove because it is used in many places, perhaps by
external eventscripts where it has been copied from existing scripts.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Jose A. Rivera <jarrpa@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>