tests: os: connectivity: test redsocks config via supervisor api

[rcooke-warwick]

A regression was introduced with supervisor 16.4.0 that broke proxy configuration via the supervisor API, when using the noProxy parameter. This commit adds a test to configure via the supervisor API, hoping to catch issues such as these

Change-type: patch

This test passes on 5.3.15 locally (before supervisor 16.4.0 , and fails on 5.4.0 (after supervisor 16.4.0) due to the redsocks.conf incorrectly having a noProxy field added to it, resulting in this:

Aug 08 13:27:59 8f94e56 redsocks[5915]: file parsing error at line 13: unexpected char
Aug 08 13:27:59 8f94e56 redsocks[5915]: file parsing error at line 13: unclosed section
Aug 08 13:27:59 8f94e56 redsocks[5915]: file parsing error at line 13: stale key_token
Aug 08 13:27:59 8f94e56 redsocks[5915]: file parsing error at line 13: stale value_token
Aug 08 13:27:59 8f94e56 systemd[1]: redsocks.service: Main process exited, code=exited, status=1/FAILURE
Aug 08 13:27:59 8f94e56 systemd[1]: redsocks.service: Failed with result 'exit-code'. 

---

Contributor checklist

• Changes have been tested
  • Covered in automated test suite
  • Manual test case recorded
• Change-type present on at least one commit
• Signed-off-by is present
• The PR complies with the Open Embedded Commit Patch Message Guidelines

Reviewer Guidelines

• When submitting a review, please pick:
  • 'Approve' if this change would be acceptable in the codebase (even if there are minor or cosmetic tweaks that could be improved).
  • 'Request Changes' if this change would not be acceptable in our codebase (e.g. bugs, changes that will make development harder in future, security/performance issues, etc).
  • 'Comment' if you don't feel you have enough information to decide either way (e.g. if you have major questions, or you don't understand the context of the change sufficiently to fully review yourself, but want to make a comment)

[github-actions]

Website deployed to CF Pages, 👀 preview link https://fc6e7d49.balena-os.pages.dev

[pipex]

@rcooke-warwick the commit/PR body mention a noHup configuration when I think you mean noProxy