[ticket/17535] Convert config files, make data providers static

PHPBB-17535

tests/controller/helper_route_other_app.php

@@ -30,7 +30,7 @@ class phpbb_controller_helper_route_other_app_test extends phpbb_controller_comm
 		return 'app.php';
 	}
 
-	protected function path_to_app()
+	protected static function path_to_app()
 	{
 		return 'foo/';
 	}