message: [agent] start the Thread stack when resuming network
diff: @@ -346,6 +346,7 @@ otError ThreadHelper::TryResumeNetwork(void)
  if (!otIp6IsEnabled(mInstance))
  {
  SuccessOrExit(err = otIp6SetEnabled(mInstance, true));
  + SuccessOrExit(err = otThreadSetEnabled(mInstance, true));
  }
  }
  