update copyright notice / whitespace

bin/tests/system/cds/checktime.pl

@@ -1,4 +1,10 @@
 #!/usr/bin/perl
+#
+# Copyright (C) 2017  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
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 $target = shift;
 while (<>) {