Add --skip-validation option to generate model command

[fredbi]

No description provided.

[codecov]

Codecov Report

Merging #1442 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1442      +/-   ##
==========================================
+ Coverage   72.99%   72.99%   +<.01%     
==========================================
  Files          37       37              
  Lines        6880     6881       +1     
==========================================
+ Hits         5022     5023       +1     
  Misses       1406     1406              
  Partials      452      452

Impacted Files	Coverage Δ
cmd/swagger/commands/generate/model.go	75% <100%> (+1.66%)	⬆️

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