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-sharedzone3.conf

@@ -17,7 +17,7 @@ view first {
 
 view second {
 	zone shared.example {
-		type master;
+		type primary;
 		file "shared.example.db";
 	};
 };