fix(cli): Fix issue when running sysctl through USR2 in macOS

[msbrogli]

Motivation

macOS has a different behavior when handling named pipes created by mkfifo.

In macOS, if a fifo is opened for reading, the open() call will block if there are no writers—that is, if somebody else does not have the fifo open for writing.

In Linux, the open() call is not blocking so the previous code worked fine and logged the fifo path as expected.

Acceptance Criteria

1. Move out the open() call from temp_fifo().
2. Run the open() after logging the fifo path.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1f68ec7) 85.42% compared to head (5d059ca) 85.31%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #956      +/-   ##
==========================================
- Coverage   85.42%   85.31%   -0.12%     
==========================================
  Files         292      292              
  Lines       22568    22581      +13     
  Branches     3395     3401       +6     
==========================================
- Hits        19278    19264      -14     
- Misses       2621     2641      +20     
- Partials      669      676       +7     

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