Workaround tests hanging on ppcel64

[didrocks]

When killing smbd process, on ppcel64, stderr was not closed, causing
the tests to hang forever.

[codecov-commenter]

Codecov Report

Merging #295 (3973c14) into main (20e6f96) will increase coverage by 0.02%.
The diff coverage is 57.57%.

@@            Coverage Diff             @@
##             main     #295      +/-   ##
==========================================
+ Coverage   84.78%   84.80%   +0.02%     
==========================================
  Files          56       56              
  Lines        3891     3897       +6     
==========================================
+ Hits         3299     3305       +6     
+ Misses        373      372       -1     
- Partials      219      220       +1     

Impacted Files	Coverage Δ
internal/policies/scripts/scripts.go	83.21% <45.00%> (+0.78%)	⬆️
internal/policies/policies.go	79.27% <76.92%> (+0.15%)	⬆️

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[jibel]

nice catch!