CBQE-0:fix rebalance progress tests

Change-Id: I782ca154b77de2bac31ed8a0ffc08c42a565cee8
Reviewed-on: http://review.couchbase.org/40608
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>