ci: add unittest execution

[krichprollsch]

No description provided.

[karlseguin]

I'd like to fix this after refactor CDP is merged. It's a small fix, but it'll just cause a conflict on that PR.

I believe this issue is long-standing and it's the rapid reconnect of the unit test that's bringing it to light.

Client connects, timeout is registered using (&server.timeout_completion), client disconnects. Another client connects before the timeoutCbk is called, another timeout is registered with the same &server.timeout_completion, causing the issue. The fix is that each client needs its own timeout_completion and, on callback, we need to check if the callback completion == current client's completion.

Interestingly, when I added the tests, I noticed that it was really slow (200ms). I traced it back to this issue, but I didn't think through the full implications of re-submitting the same completion. Linux's behavior of crashing makes more sense to me than Mac being slow.