MB-1143 Switch to star replication.

Change-Id: If8f757437d0eb72f991f5318179c7482356e1f32
Reviewed-on: http://review.couchbase.org/27330
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>