CBQE-0:fix rebalance out test

Change-Id: I25f1a09c12d0f08f14cbe2df9290cb7411ad11d1
Reviewed-on: http://review.couchbase.org/40686
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>