JDC does not exchange messages with TP in Integration Tests

[plebhash]

while working on #1419 I noticed that JDC is not connecting to TP

here's a little snippet that illustrates the problem:

#[tokio::test]
async fn jdc_test() {
    let (_tp, tp_addr) = start_template_provider(None).await;
    let (_pool, pool_addr) = start_pool(Some(tp_addr)).await;
    let (_jds, jds_addr) = start_jds(tp_addr).await;

    let (sniffer_pool, sniffer_pool_addr) =
        start_sniffer("0".to_string(), pool_addr, false, None).await;

    let (sniffer_jds, sniffer_jds_addr) =
        start_sniffer("1".to_string(), jds_addr, false, None).await;

    let (sniffer_tp, sniffer_tp_addr) =
        start_sniffer("2".to_string(), tp_addr, false, None).await;

    let (_jdc, jdc_addr) = start_jdc(sniffer_pool_addr, sniffer_tp_addr, sniffer_jds_addr).await;
    let (_translator, tproxy_addr) = start_sv2_translator(jdc_addr).await;

    println!("sniffer_pool {:?}", sniffer_pool.next_message_from_downstream());
    println!("sniffer_pool {:?}", sniffer_pool.next_message_from_upstream());

    println!("sniffer_jds {:?}", sniffer_jds.next_message_from_downstream());
    println!("sniffer_jds {:?}", sniffer_jds.next_message_from_upstream());
    
    println!("sniffer_tp {:?}", sniffer_tp.next_message_from_downstream());
    println!("sniffer_tp {:?}", sniffer_tp.next_message_from_upstream());
}

the behavior:

    Finished test [optimized + debuginfo] target(s) in 0.91s
     Running tests/jds_integration.rs (/Users/plebhash/develop/stratum/roles/target/debug/deps/jds_integration-caf345f2043f64aa)

running 1 test
sniffer_pool Some((0, Common(SetupConnection(SetupConnection { protocol: MiningProtocol, min_version: 2, max_version: 2, flags: 6, endpoint_host: Owned([48, 46, 48, 46, 48, 46, 48]), endpoint_port: 50, vendor: Owned([]), hardware_version: Owned([]), firmware: Owned([]), device_id: Owned([]) }))))
sniffer_pool Some((1, Common(SetupConnectionSuccess(SetupConnectionSuccess { used_version: 2, flags: 6 }))))
sniffer_jds Some((0, Common(SetupConnection(SetupConnection { protocol: JobDeclarationProtocol, min_version: 2, max_version: 2, flags: 1, endpoint_host: Owned([49, 50, 55, 46, 48, 46, 48, 46, 49]), endpoint_port: 57389, vendor: Owned([]), hardware_version: Owned([]), firmware: Owned([]), device_id: Owned([]) }))))
sniffer_jds Some((1, Common(SetupConnectionSuccess(SetupConnectionSuccess { used_version: 2, flags: 1 }))))
sniffer_tp None
sniffer_tp None