Fix retrying of SocketTimeoutExceptions in HttpConnector

As part of investigation of #8974 I found that recent change 982e0b8398ea26ce1f5323b9e928990ae8845473 broke retries of `SocketTimeoutException` in `HttpConnector`, intention of that change was good but lack of tests resulted in broken logic.

IntelliJ highlights the problem ? branch with `instanceof SocketTimeoutException` would have never been executed:

<img width="764" alt="Screen Shot 2019-07-29 at 3 26 11 PM" src="https://user-images.githubusercontent.com/967132/62089179-d7bfa400-b21c-11e9-882a-1c1fe1fcb683.png">

---

This PR adds missing tests and fixes the logic to still present `SocketTimeoutException` as `IOException` for upstream consumers while handling it properly internally in the `HttpConnector`.

Closes #9008.

PiperOrigin-RevId: 261675244
4 files changed
tree: 706330966a630deaf1e9614993c2ee9717aebbf0
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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