CBQE-0: fix rebalance-in tests and remove redundant tests

Change-Id: I75e73e51cafeb09ff1e068d0d37e8d7e68cc5561
Reviewed-on: http://review.couchbase.org/43702
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>