Merge Master into Stable

[reactive-firewall]

• improved test coverage
• Drive-by fixes
• stability improvements

[codecov-io]

Codecov Report

Merging #30 into stable will increase coverage by 1.75%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           stable      #30      +/-   ##
==========================================
+ Coverage   77.77%   79.52%   +1.75%     
==========================================
  Files          26       26              
  Lines        2178     2125      -53     
==========================================
- Hits         1694     1690       -4     
+ Misses        484      435      -49

Impacted Files	Coverage Δ
piaplib/pku/upgrade.py	60% <0%> (+8.68%)	⬆️
piaplib/keyring/rand.py	95.33% <100%> (+0.03%)	⬆️
piaplib/keyring/clearify.py	95.91% <100%> (+24.79%)	⬆️
piaplib/pku/utils.py	77.45% <50%> (+0.11%)	⬆️
piaplib/lint/users_check_status.py	83.14% <0%> (+0.38%)	⬆️

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