Replace custom private IP range check with built-in net.IP.IsPrivate

[kumapower17]

Replace isPrivateIPRange with built-in method net.IP.IsPrivate

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.38%. Comparing base (f24aaff) to head (79107e7).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2835      +/-   ##
==========================================
+ Coverage   93.25%   93.38%   +0.13%     
==========================================
  Files          39       39              
  Lines        4652     4659       +7     
==========================================
+ Hits         4338     4351      +13     
+ Misses        218      214       -4     
+ Partials       96       94       -2     

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[aldas]

LGTM

[aldas]

Thanks