func (l *RootPeerList) GetOrAdd(hostPort string) *Peer {
	peer, ok := l.Get(hostPort)
	if ok {
		return peer
	}

	return l.Add(hostPort)
}
func (l *RootPeerList) GetOrAdd(hostPort string) *Peer {
	peer, ok := l.Get(hostPort)
	if ok {
		return peer
	}

	return l.Add(hostPort)
}
// GetOrAdd returns a peer for the given hostPort, creating one if it doesn't yet exist.