don't enable user_external

tests/enable_all.php

@@ -14,5 +14,5 @@ OC_App::enable('files_archive');
 OC_App::enable('mozilla_sync');
 OC_App::enable('news');
 OC_App::enable('provisioning_api');
-OC_App::enable('user_external');
+#OC_App::enable('user_external');