CBQE-0: fix failing rebalanceinout tests

Change-Id: If978921eec7d105d94d96444317e83bf64432361
Reviewed-on: http://review.couchbase.org/43616
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>