Refactor: adaptions due to rename of upr api to dcp in memcached

Change-Id: Ifc9768f6064e090e1c28b1dd6138120cf18489fa
Reviewed-on: http://review.couchbase.org/39763
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>