Remove unused upr response codes

Change-Id: I1944365f77703d18027310d70904b7a5aa4008f3
Reviewed-on: http://review.couchbase.org/30977
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung@couchbase.com>