Add checkconf tests for [#2463]

Add two tests to make sure named-checkconf catches key-directory issues
where a zone in multiple views uses the same directory but has
different dnssec-policies. One test sets the key-directory specifically,
the other inherits the default key-directory (NULL, aka the working
directory).

Also update the good.conf test to allow zones in different views
with the same key-directory if they use the same dnssec-policy.

Also allow zones in different views with different key-directories if
they use different dnssec-policies.

Also allow zones in different views with the same key-directories if
only one view uses a dnssec-policy (the other is set to "none").

Also allow zones in different views with the same key-directories if
no views uses a dnssec-policy (zone in both views has the dnssec-policy
set to "none").

bin/tests/system/checkconf/bad-kasp-keydir1.conf

@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+
+key "keyforview1" {
+	algorithm "hmac-sha1";
+	secret "YPfMoAk6h+3iN8MDRQC004iSNHY=";
+};
+
+key "keyforview2" {
+	algorithm "hmac-sha1";
+	secret "4xILSZQnuO1UKubXHkYUsvBRPu8=";
+};
+
+view "example1" {
+	match-clients { key "keyforview1"; };
+
+	zone "example.net" {
+		type primary;
+		dnssec-policy "default";
+		key-directory ".";
+		file "example1.db";
+	};
+};
+
+view "example2" {
+	match-clients { key "keyforview2"; };
+
+	zone "example.net" {
+		type primary;
+		dnssec-policy "insecure";
+		key-directory ".";
+		file "example2.db";
+	};
+};