[rel-3.0.1.xml] point ns_server to rel-3.0.1 branch

Change-Id: Iedba73788169abf8e8b7d9951489521bd2ec2676
Reviewed-on: http://review.couchbase.org/42357
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Chris Hillery <ceej@couchbase.com>