MB-100 Bump mb_master advertised version for 2.2.0

Change-Id: Idaf768a71898359990810e341733a8171a56ab03
Reviewed-on: http://review.couchbase.org/27829
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>