construct a symtab of valid in-view targets then check that the target exists

bin/tests/system/checkconf/bad-sharedzone3.conf

@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+
+view first {
+	zone shared.example {
+		in-view second;
+	};
+};
+
+view second {
+	zone shared.example {
+		type master;
+		file "shared.example.db";
+	};
+};