Function negotiate_version 

pub async fn negotiate_version<PeerTransport>(
    peer_conn: &mut Framed<PeerTransport, Codec>,
    connected_addr: &ConnectedAddr,
    config: Config,
    nonces: Arc<Mutex<IndexSet<Nonce>>>,
    user_agent: String,
    our_services: PeerServices,
    relay: bool,
    minimum_peer_version: MinimumPeerVersion<impl ChainTip>,
) -> Result<Arc<ConnectionInfo>, HandshakeError>
where
    PeerTransport: AsyncRead + AsyncWrite + Unpin + Send + 'static,

Negotiate the Zcash network protocol version with the remote peer at connected_addr, using the connection peer_conn.

We split Handshake into its components before calling this function, to avoid infectious Sync bounds on the returned future.

Returns the VersionMessage sent by the remote peer, and the Version negotiated with the remote peer, inside a ConnectionInfo struct.