MB-8229 Disallow renaming of nodes that are part of a cluster.

Change-Id: I190bca9701ead2b73795756ed84b5f4678b07e4c
Reviewed-on: http://review.couchbase.org/26252
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>