add nm heartbeat time monitor

nm/start.go

@@ -102,6 +102,7 @@ func StartMonitor() {
 						log.WithField("is success", isSuccess).Warn("Try to connect node manager client:", manager.Info.Endpoint)
 						if isSuccess {
 							log.Info("Connect node manager client success:", manager.Info.Endpoint)
+							managerClient.UpdateLastHeartTime(time.Now())
 							continue
 						}
 					}