update copyright notice / whitespace

bin/tests/system/rndc/tests.sh

 #!/bin/sh
 #
-# Copyright (C) 2011-2017  Internet Systems Consortium, Inc. ("ISC")
+# Copyright (C) 2011-2018  Internet Systems Consortium, Inc. ("ISC")
 #
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this