Remove extraneous argument in Connection_server_nodes

Change-Id: I8516d7df4201d86f8b0ea07fbe1cdd5403333688
Reviewed-on: http://review.couchbase.org/26346
Reviewed-by: Mordechai Nunberg <mnunberg@haskalah.org>
Tested-by: Mordechai Nunberg <mnunberg@haskalah.org>