CBQE-0: upr is now default. Support for setting to tap

Change-Id: Ia444e8d2cf23a42c34107c826a264cc6005ab9bf
Reviewed-on: http://review.couchbase.org/37569
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>