CBQE-0:: extended sanity for rebalance

Change-Id: Icad6b5460e85c11dc8b3268eb4bf5a0c20dcf088
Reviewed-on: http://review.couchbase.org/41853
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>