Add upr log header in all upr stream log messages

Change-Id: Icfec95e9e449b4ccb84563373aea04e3d139a528
Reviewed-on: http://review.couchbase.org/34911
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>