externalldap: async'ify

and make the tests work again

src/test/common.js

@@ -131,6 +131,8 @@ exports = module.exports = {
     manifest,
     user,
     appstoreToken: 'atoken',
+
+    serverUrl: `http://localhost:${constants.PORT}`,
 };
 
 function createTree(root, obj) {