code: func newPredefinedNetwork(name, driver string) *api.Network {
  	return &api.Network{
  		ID: identity.NewID(),
  		Spec: api.NetworkSpec{
  			Annotations: api.Annotations{
  				Name: name,
  				Labels: map[string]string{
  					networkallocator.PredefinedLabel: "true",
  				},
  			},
  			DriverConfig: &api.Driver{Name: driver},
  		},
  	}
  }
docs: // Creates a network object representing one of the predefined networks
  // known to be statically created on the cluster nodes. These objects
  // are populated in the store at cluster creation solely in order to
  // support running services on the nodes' predefined networks.
  // External clients can filter these predefined networks by looking
  // at the predefined label.