CBQE-0:fix rebalance out test

Change-Id: Ic395fe267907fe35afb44b554a012d5ad17fae66
Reviewed-on: http://review.couchbase.org/40640
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>