cmd/go/internal/test: scale the WaitDelay for test subprocesses

Prior to CL 456116 we had an arbitrary 5-second delay after a test
times out before we kill the test. In CL 456116, I reused that
arbitrary 5-second delay as the WaitDelay as well, but on slower
builders it does not seem to be generous enough.

Instead of hard-coding the delay, for tests with a finite timout we
now use a hard-coded fraction of the overall timeout. That will
probably give delays that are longer than strictly necessary for very
long timeouts, but if the user is willing to wait for a very long
timeout they can probably wait a little longer for I/O too.

Fixes #58230.
Updates #24050.

Change-Id: Ifbf3e576c034c721aa00cd17bf88563474b09955
Reviewed-on: https://go-review.googlesource.com/c/go/+/464555
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
2 files changed
tree: f04169d114d8d943ea595b0ae0d261845aa0e181
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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