CBQE-0: made graceful failover False by default so keep the behaviour of current tests same

Change-Id: Id949f9e8d87f12caa0e82ef7e146e2319d309eb8
Reviewed-on: http://review.couchbase.org/39660
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>