Remove duplication around cobra code.

[dgageot]

Signed-off-by: David Gageot [email protected]

[codecov-io]

Codecov Report

Merging #2145 into master will increase coverage by 0.44%.
The diff coverage is 82.72%.

@@            Coverage Diff             @@
##           master    #2145      +/-   ##
==========================================
+ Coverage   56.31%   56.76%   +0.44%     
==========================================
  Files         180      181       +1     
  Lines        7815     7829      +14     
==========================================
+ Hits         4401     4444      +43     
+ Misses       2994     2976      -18     
+ Partials      420      409      -11

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/diagnose.go	34.78% <100%> (+4.01%)	⬆️
cmd/skaffold/app/cmd/cmd.go	75.65% <100%> (+1.39%)	⬆️
cmd/skaffold/app/cmd/commands/commands.go	100% <100%> (ø)
cmd/skaffold/app/cmd/build.go	74.35% <100%> (+5.31%)	⬆️
cmd/skaffold/app/cmd/config/flags.go	100% <100%> (ø)	⬆️
cmd/skaffold/app/cmd/config/unset.go	47.61% <53.84%> (ø)	⬆️
cmd/skaffold/app/cmd/init.go	57.14% <55%> (+2.59%)	⬆️
cmd/skaffold/app/cmd/config/set.go	74.02% <58.33%> (ø)	⬆️
cmd/skaffold/app/cmd/run.go	42.85% <72.72%> (+5.35%)	⬆️
cmd/skaffold/app/cmd/version.go	77.77% <75%> (+31.62%)	⬆️
... and 9 more

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