Low: CTDB: Use op timeout when invoking ctdb client (bnc#697428)

The ctdb client is invoked by the CTDB resource agent during monitoring
and shutdown to interact with the local node's ctdb daemon. Under heavy
load, ctdb's per-request timeout (default 3s) may be hit. This change
increases the request timeout and total runtime to the timeout for the
current op.

Signed-off-by: Tim Serong <tserong@novell.com>