Remove now unused is_node_compatible/2.
Remove now unused is_node_compatible/2.

Change-Id: I91302aefea54fdd3213e365836c363a5a2f4a3a2
Reviewed-on: http://review.couchbase.org/89216
Tested-by: Aliaksey Artamonau <ce14b1c16e0fd654f926118eb8addbec5aff4ffa@couchbase.com>
Well-Formed: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>

membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server,membase/ns_server