Flaky test in SPU stream_fetch

[nicholastmosher]

The following test has been causing a bunch of sporadic test failures in CI:

• https://github.com/infinyon/fluvio/blob/master/src/spu/src/services/public/stream_fetch.rs#L529-L673
• https://github.com/infinyon/fluvio/runs/2306356093?check_suite_focus=true#step:9:407

This is probably because the test is creating actual sockets, which might be making it vulnerable to shakiness if the underlying system isn't ready. We should probably create some kind of timeout/retry mechanism to the test.

---

Here is the error from CI:

cd src/socket; cargo test --no-default-features --features tls test_multiplexing_native_tls
...
     Running target/debug/deps/fluvio_spu-f81824b57bd12f41

running 15 tests
test controllers::follower_replica::state::test::test_insert_and_remove_state ... ok
test controllers::leader_replica::replica_state::test::test_follower_hw22_sync ... ok
test controllers::leader_replica::replica_state::test::test_follower_hw32_sync ... ok
test controllers::leader_replica::replica_state::test::test_follower_hw33_sync ... ok
test controllers::leader_replica::replica_state::test::test_leader_update_sync ... ok
test controllers::leader_replica::leaders_state::test_channel::test_event_shutdown_sync ... ok
test core::spus::metadata::test::test_indexed_by_id ... ok
test core::spus::metadata::test::test_peer_spu_routines ... ok
test core::store::test::test_apply_changes ... ok
test core::store::test::test_sync_all ... ok
test controllers::replica_test::test_initial_replication_sync ... ok
Apr 09 13:59:36.588 ERROR fluvio_socket::multiplexing: error sending to socket, no socket receiver founded for id: 2, abandoning sending
test services::public::stream_fetch::test::test_stream_filter_fetch_sync ... ok
test services::public::stream_fetch::test::test_stream_filter_max_sync ... ok
test smart_stream::filter::test::test_file ... ok
test services::public::stream_fetch::test::test_stream_fetch_sync ... test services::public::stream_fetch::test::test_stream_fetch_sync has been running for over 60 seconds
Error: The action has timed out.

[sehz]

Make this as optional test in CI

[nicholastmosher]

Closed by #1070