add test for config's service

tests/fake_services/server/__init__.py

@@ -0,0 +1 @@
+from .server import Risotto

tests/fake_services/server/server.py

@@ -0,0 +1,8 @@
+from risotto.controller import Controller
+from risotto.register import register
+
+
+class Risotto(Controller):
+    @register('v1.server.list', None)
+    async def server_list(self):
+        return [{'server_id': 3, 'servername': 'one', 'serverdescription': 'the first', 'servermodelid': 1}]