CBQE-2403:: fix data client to check for all buckets

Change-Id: I8ca60e92862b26a2f433c09ddd9eafe745f15970
Reviewed-on: http://review.couchbase.org/41203
Tested-by: buildbot <build@couchbase.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>