CBQE-0 :: rename upr to dcp for rebalance and failover tests

Change-Id: Ia641cd2c40a965e974c52ac9591bac7642a3dfd1
Reviewed-on: http://review.couchbase.org/40194
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: buildbot <build@couchbase.com>