修复iotnode更新iotcenter地址后不自动重连的问题

projects/IoT/IoT.Shared/Application/Services/NodeService.cs

@@ -553,6 +553,10 @@ namespace Application.Services
                     if (Connection.State == HubConnectionState.Disconnected)
                     {
                         Console.WriteLine("start connect");
+                        if (this._notifyHost != this._cfg["notify:host"])
+                        {
+                            InitConnection();
+                        }
                         Connection.StartAsync().Wait();
                         this.Notify();
                     }