CBQE-0 :: fix [failing ops + graceful] failover tests

Change-Id: I7ca1d31cf2ddbd91af57315b7ae4854f64d8fb60
Reviewed-on: http://review.couchbase.org/40366
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>