To be able to label incoming tor connections as different from normal localhost connections in e.g. `getpeerinfo` and the peers list in the GUI it'd be useful to have them connect on an alternative local-only port. Or even better, a UNIX socket.

For manually set-up hidden services this would have to be configured manually and could add a `hsport` option or such. The external port would still appear as `XXXXXXXXX.onion:8333`, however internally it would redirect to a that port.

In the case of `torcontrol` this would be easy to set up automatically. It could add a new (localhost) binding port automatically and this code would have to be changed:
- https://github.com/bitcoin/bitcoin/blob/master/src/torcontrol.cpp#L441
- https://github.com/bitcoin/bitcoin/blob/master/src/torcontrol.cpp#L477

{
    stats.nodeid = this->GetId();
    X(nServices);
    X(addr);
    X(addrBind);
    stats.m_mapped_as = addr.GetMappedAS(m_asmap);
    if (m_tx_relay != nullptr) {
        LOCK(m_tx_relay->cs_filter);
        stats.fRelayTxes = m_tx_relay->fRelayTxes;
    } else {
        stats.fRelayTxes = false;
    }
    X(nLastSend);
    X(nLastRecv);
    X(nLastTXTime);
    X(nLastBlockTime);
    X(nTimeConnected);
    X(nTimeOffset);
    stats.addrName = GetAddrName();
    X(nVersion);
    {
        LOCK(cs_SubVer);
        X(cleanSubVer);
    }
    stats.fInbound = IsInboundConn();
    stats.m_manual_connection = IsManualConn();