admin: fix misuse of Packet.setId

What Packet.setId does was overridden by Connection.answer
and that would have broken concurrent queries to the admin node
(this is something we currently don't do).

neo/admin/handler.py

@@ -101,8 +101,7 @@ class MasterEventHandler(EventHandler):
         if forward is None:
             super(MasterEventHandler, self).dispatch(conn, packet, kw)
         else:
-            packet.setId(kw['msg_id'])
-            forward.answer(packet)
+            forward.send(packet, kw['msg_id'])
 
     def answerClusterState(self, conn, state):
         self.app.cluster_state = state