CBQE-0: Change flags to 0x20 for Rebalance and Failover tests - MB 12328

Change-Id: Ib8d66374b1dd78838747aeef3e5eb3742aeba112
Reviewed-on: http://review.couchbase.org/42437
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>