code: func (daemon *Daemon) ReleaseIngress() (<-chan struct{}, error) {
  	done := make(chan struct{})
  	daemon.enqueueIngressJob(&ingressJob{nil, nil, done})
  	return done, nil
  }
docs: // ReleaseIngress releases the ingress networking.
  // The function returns a channel which will signal the caller when the programming is completed.