change prefix for replication UPR connections to replication:

Change-Id: I170d66b87b271ea478d65f53d3c869e8f20b5e1e
Reviewed-on: http://review.couchbase.org/37403
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>