CBQE-0: fix RebalanceIn Test failures

Change-Id: I55d68ed9db82a60e126c889c1c9214b6c1178e2f
Reviewed-on: http://review.couchbase.org/37299
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>