Update memcached for rel-3.0.0.xml

Change-Id: I1be452b5a1bcab47e0f8c26eb3adfc7aa358c822
Reviewed-on: http://review.couchbase.org/29244
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>