Add tests for mkeys with unsupported algorithm

These tests check if a key with an unsupported algorithm in
managed-keys is ignored and when seeing an algorithm rollover to
an unsupported algorithm, the new key will be ignored too.

bin/tests/system/mkeys/ns7/named.conf.in

@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+
+// NS7
+
+options {
+	query-source address 10.53.0.7;
+	notify-source 10.53.0.7;
+	transfer-source 10.53.0.7;
+	port @PORT@;
+	pid-file "named.pid";
+	listen-on { 10.53.0.7; };
+	listen-on-v6 { none; };
+	recursion yes;
+	notify no;
+	dnssec-enable yes;
+	dnssec-validation auto;
+	bindkeys-file "managed.conf";
+};
+
+key rndc_key {
+	secret "1234abcd8765";
+	algorithm hmac-sha256;
+};
+
+controls {
+	inet 10.53.0.7 port @CONTROLPORT@ allow { any; } keys { rndc_key; };
+};
+
+view view1 {
+	zone "." {
+		type hint;
+		file "../../common/root.hint";
+	};
+};
+
+view view2 {
+	zone "." {
+		type hint;
+		file "../../common/root.hint";
+	};
+};