make sure that docs_sup and xdcr_sup won't restart children during node rename

because it causes more crashes due to net_kernel being down

Change-Id: I8607c128d63f21833f3a2fa3b000dbdcd69fd49a
Reviewed-on: http://review.couchbase.org/43623
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>