Use the new fortio.org/cli to greatly simplify main code

[ldemailly]

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[codeclimate]

Code Climate has analyzed commit 5d3f87e and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Base: 91.57% // Head: 90.13% // Decreases project coverage by -1.45% ⚠️

Coverage data is based on head (5d3f87e) compared to base (0bb5ed8).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   91.57%   90.13%   -1.45%     
==========================================
  Files           1        1              
  Lines         178      152      -26     
==========================================
- Hits          163      137      -26     
  Misses         11       11              
  Partials        4        4              

Impacted Files	Coverage Δ
dnsping.go	90.13% <100.00%> (-1.45%)	⬇️

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