MB-11811: Change feature name from UPR to DCP

Change-Id: Iae789636614d293c80bf76608d44ccf1ef9f0c79
Reviewed-on: http://review.couchbase.org/39814
Reviewed-by: Bin Cui <bin.cui@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>