MB-19429 aggregate RAM and disk information only for kv nodes
MB-19429 aggregate RAM and disk information only for kv nodes

...on Cluster Overview page

Server Nodes page will display RAM and disk information for node
even if it doesn't run kv service

Change-Id: I6809b618e6556b5ae06c4f09c11de6ff22a0682a
Reviewed-on: http://review.couchbase.org/63736
Tested-by: Artem Stemkovski <15a0730a27c69f62ab86f2b6c639fca202166c02@couchbase.com>
Reviewed-by: Poonam D <6855f09986fe28ed7e8cdd9d60db878d898703d5@couchbase.com>

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