test: use provided (simulated) time in qlogs

[mxinden]

When logging qlog events, we currently use qlog's add_event_data_now which internally calls std::time::Instant::now().

neqo/neqo-common/src/qlog.rs

Line 117 in e08c14f

s.add_event_data_now(ev_data)?;

This is fine when capturing qlogs in real-time.

Problem arises when used with the text_fixtures::Simulator, which simulates time, i.e. where std::time::Instant::now() has no meaning.

I suggest we use qlogs add_event_data_with_instant, using now: Instant available e.g. through now parameter on Connection::process.

neqo/neqo-transport/src/connection/mod.rs

Line 1165 in e08c14f

pub fn process(&mut self, dgram: Option<Datagram<impl AsRef<[u8]>>>, now: Instant) -> Output {

Status: preparing a draft. Thus far, this is very noisy, given that now needs to be passed across many layers.

[larseggert]

Sound good.

Related, it would be nice to see virtual time in the debug output for tests, and not clock time.

[mxinden]

I sketched a fix for this issue in #2212. Long story short, I don't think it is worth it. See PR description in #2212.

Let me know if you think otherwise, or have a better solution.