Function validate_version_msg 

async fn validate_version_msg(
    msg: &PeerNetMsg,
    config_version: &Version,
    protocols: &HashMap<ProtocolID, ProtocolMeta>,
    verified_peer_id: Option<&PeerID>,
) -> Result<(PeerID, Vec<ProtocolID>)>

Validates the given version msg. Returns the remote peer ID and the intersection of compatible protocols.