MB-100 change config version to {2,3,0}

Change-Id: Ia16492d45209087f52e80a4c7b7dcb160e428b88
Reviewed-on: http://review.couchbase.org/29524
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>