Locking rel-3.0.2.xml for RC build

Also removed "membase" remote per MB-12185.

Change-Id: Ibf774944102cdef8be1515f933fe207a97f4f609
Reviewed-on: http://review.couchbase.org/43826
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>