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

LogPrintf("tor: Error writing service private key to %s\n", GetPrivateKeyFile().string());
        }
        AddLocal(service, LOCAL_MANUAL);
        
    } else if (reply.code == 510) { 
        LogPrintf("tor: Add onion failed with unrecognized command (You probably need to upgrade Tor)\n");
    } else {
        LogPrintf("tor: Add onion failed; error code %d\n", reply.code);
    }
}
void TorController::auth_cb(TorControlConnection& _conn, const TorControlReply& reply)
{
    if (reply.code == 250) {
        LogPrint(BCLog::TOR, "tor: Authentication successful\n");
        
        
        if (gArgs.GetArg("-onion", "") == "") {
            CService resolved(LookupNumeric("127.0.0.1", 9050));
            proxyType addrOnion = proxyType(resolved, true);
            SetProxy(NET_ONION, addrOnion);
            SetReachable(NET_ONION, true);
        }
        
        if (private_key.empty()) 
            private_key = "NEW:RSA1024"; 
        
        
        _conn.Command(strprintf("ADD_ONION %s Port=%i,127.0.0.1:%i", private_key, Params().GetDefaultPort(), GetListenPort()),
            std::bind(&TorController::add_onion_cb, this, std::placeholders::_1, std::placeholders::_2));
    } else {