CBQE-0: add support for data comparison active vs replica for simple-tests

Change-Id: I33e257b7cfe5593b5e110850056069452b09f9b8
Reviewed-on: http://review.couchbase.org/36899
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>