network: fix PeerAddr() for not-yet-handshaked case

If we have already got Version message, we don't need the rest of handshake to
complete before being able to properly answer the PeerAddr() requests. Fixes
some duplicate connections between machines.

pkg/network/tcp_peer.go

@@ -333,7 +333,7 @@ func (p *TCPPeer) RemoteAddr() net.Addr {
 func (p *TCPPeer) PeerAddr() net.Addr {
 	remote := p.conn.RemoteAddr()
 	// The network can be non-tcp in unit tests.
-	if !p.Handshaked() || remote.Network() != "tcp" {
+	if p.version == nil || remote.Network() != "tcp" {
 		return p.RemoteAddr()
 	}
 	host, _, err := net.SplitHostPort(remote.String())