fix minor bugs

[shreyas-badiger]

• Complete percentage used to show negative values. Avoid setting progress when the values are below allowed values.
• Remove clean target from generate target.
• Fixes - https://github.com/keikoproj/upgrade-manager/issues/323

[codecov[bot]]

Codecov Report

Merging #334 (fabcf11) into master (b33f5ae) will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   39.14%   39.22%   +0.08%     
==========================================
  Files           7        7              
  Lines         723      724       +1     
==========================================
+ Hits          283      284       +1     
  Misses        415      415              
  Partials       25       25              

Flag	Coverage Δ
unittests	39.22% <100.00%> (+0.08%)	:arrow_up:

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

Impacted Files	Coverage Δ
controllers/upgrade.go	45.91% <100.00%> (+0.14%)	:arrow_up:

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