gexec: some impatient unit tests fail even on not-sluggish systems

[thediveo]

While an Intel Haswell Core i7 isn't exactly the newest kid on the block(chain), it isn't a slug either. On an Ubuntu 22.04.1LTS two gexec unit tests fail reproducibly: both start one or more sleeps and then send it/them SIGABRT. None of them manages to keep the tight 1s default limit. Raising these allowed deadline to safe 3s (or maybe 5s) allow them to pass every time. As it seems, SIGABRT-based tests need more headroom on systems for which core dumps are getting written (even with a snappy SSD).

The affected tests are session_test.go lines 127 and 241.

Wanna PR?

[onsi]

😂 yes please and thank you