Improve UNIX domain parsing

[JSCU-CNI]

In succession of #1079, this PR aims to fix UNIX domain parsing by filtering "domains" such as localhost and ip6-localhost which are commonly found in /etc/hosts.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.96%. Comparing base (32906dd) to head (509dbbf).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1114      +/-   ##
==========================================
+ Coverage   77.93%   77.96%   +0.02%     
==========================================
  Files         355      355              
  Lines       32144    32146       +2     
==========================================
+ Hits        25052    25063      +11     
+ Misses       7092     7083       -9     

Flag	Coverage Δ
unittests	77.96% <100.00%> (+0.02%)	⬆️

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