Replace "master/slave" terminology in tests

Replace most "master/slave" terminology in tests with the preferred
"primary/secondary", with the following exceptions:

- When testing the old syntax
- When master is used in master file and master file format terms
- When master is used in hostmaster or postmaster terms
- When master used in legacy domain names (for example in dig.batch)
- When there is no replacement (for example default-masters)

bin/tests/system/checkconf/bad-inline-secondary.conf

@@ -0,0 +1,20 @@
+/*
+ * 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.
+ */
+
+ /*
+  * An inline-signing secondary should be forced to have a file option
+  */
+
+  zone "." {
+	  type secondary;
+	  inline-signing yes;
+	  primaries { 10.53.0.1; };
+  };