👩‍🌾 Disable tests that consistently fail on macOS

[chapulina]

🦟 Bug fix

See #66 and #67

Summary

These tests are known to fail on macOS consistently. We should disable tests in such cases, so that CI's regular state is green and new test failures are easier to spot.

I opted for just disabling the offending lines instead of the entire test because most of the expectations succeed.

Once this is in, we can make Homebrew CI checks required to merge PRs.

Checklist

• Signed all commits for DCO
• Added tests (removed, actually 😇 )
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge

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https://github.com/osrf/buildfarmer/issues/181

[codecov]

Codecov Report

Merging #121 (8c2a952) into ign-sensors3 (2e22200) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           ign-sensors3     #121   +/-   ##
=============================================
  Coverage         77.14%   77.14%           
=============================================
  Files                23       23           
  Lines              2306     2306           
=============================================
  Hits               1779     1779           
  Misses              527      527           

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[chapulina]

Oh look at that green CI, 15 🟢 checks. A buildfarmer's dream ✨