[release-branch.go1.16] net/http: speed up and deflake TestCancelRequestWhenSharingConnection

This test made many requests over the same connection for 10
seconds, trusting that this will exercise the request cancelation
race from #41600.

Change the test to exhibit the specific race in a targeted fashion
with only two requests.

Fixes #47535.
Updates #41600.
Updates #47016.

Change-Id: If99c9b9331ff645f6bb67fe9fb79b8aab8784710
Reviewed-on: https://go-review.googlesource.com/c/go/+/339594
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
(cherry picked from commit 6e738868a7a943d7d4fd6bb1963e7f6d78111726)
Reviewed-on: https://go-review.googlesource.com/c/go/+/339830
1 file changed
tree: 85164c982acb376f3c47061405f67979b0578295
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  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. VERSION
  12. api/
  13. doc/
  14. favicon.ico
  15. lib/
  16. misc/
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  18. src/
  19. test/
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