update file headers

bin/tests/system/dnssec/signer/general/test5.zone

@@ -1,4 +1,12 @@
+; Copyright (C) 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/.
+;
+; See the COPYRIGHT file distributed with this work for additional
+; information regarding copyright ownership.
+
 ;	This is a zone which has three DNSKEY records, two (KSK +ZSK) of which
 ; have existing private key files available.  The third is a KSK.
 ;