notifiee.go
func (nb *NotifyBundle) OpenedStream(n Network, s Stream) {
	if nb.OpenedStreamF != nil {
		nb.OpenedStreamF(n, s)
	}
}
func (nb *NotifyBundle) OpenedStream(n Network, s Stream) {
	if nb.OpenedStreamF != nil {
		nb.OpenedStreamF(n, s)
	}
}
// OpenedStream calls OpenedStreamF if it is not null.