separated rel-3.0.1 config upgrade from rel-3.0.0++

Change-Id: I389f83b2f35af49261fd0e2d79517cd832b65a31
Reviewed-on: http://review.couchbase.org/43339
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>