Move functions.php to legacy

This file should really be properly namespaced etc!

lib/private/legacy/template.php

@@ -36,7 +36,7 @@
 
 use OC\TemplateLayout;
 
-require_once __DIR__.'/../template/functions.php';
+require_once __DIR__.'/template/functions.php';
 
 /**
  * This class provides the templates for ownCloud.

tests/lib/testcase.php

@@ -423,7 +423,7 @@ abstract class TestCase extends \PHPUnit_Framework_TestCase {
 	 */
 	protected function assertTemplate($expectedHtml, $template, $vars = []) {
 
-		require_once __DIR__.'/../../lib/private/template/functions.php';
+		require_once __DIR__.'/../../lib/private/legacy/template/functions.php';
 
 		$requestToken = 12345;
 		$theme = new OC_Defaults();