Migrate netutil methods into /util/net.go

[manuelbuil]

Proposed Changes

Moving two functions from one file to another

Types of Changes

Code clean up

Verification

Just do regular k3s verifications

Testing

Just do regular k3s verifications

Linked Issues

#7421

User-Facing Change

Further Comments

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.13 ⚠️

Comparison is base (e1d4cff) 19.57% compared to head (437ad12) 19.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7422      +/-   ##
==========================================
- Coverage   19.57%   19.45%   -0.13%     
==========================================
  Files          81       81              
  Lines        5461     5495      +34     
==========================================
  Hits         1069     1069              
- Misses       4170     4204      +34     
  Partials      222      222              

Flag	Coverage Δ
unittests	19.45% <0.00%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/util/net.go	5.80% <0.00%> (-1.64%)	⬇️

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