async'ify the groups code

src/test/ldap-test.js

@@ -133,20 +133,14 @@ function setup(done) {
                 callback(null);
             });
         },
-        function (callback) {
-            groups.create(GROUP_NAME, '', function (error, result) {
-                if (error) return callback(error);
+        async function () {
+            const result = await groups.add({ name: GROUP_NAME, source: '' });
 
-                GROUP_ID = result.id;
-
-                callback();
-            });
+            GROUP_ID = result.id;
         },
-        function (callback) {
-            async.series([
-                groups.addMember.bind(null, GROUP_ID, USER_0.id),
-                groups.addMember.bind(null, GROUP_ID, USER_1.id)
-            ], callback);
+        async function () {
+            await groups.addMember(GROUP_ID, USER_0.id);
+            await groups.addMember(GROUP_ID, USER_1.id);
         }
     ], done);
 }