Support secretGenerators with kustomize

[dgageot]

Fixes #1035

[codecov-io]

Codecov Report

Merging #1488 into master will increase coverage by 0.02%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #1488      +/-   ##
==========================================
+ Coverage   44.82%   44.85%   +0.02%     
==========================================
  Files         115      115              
  Lines        4767     4769       +2     
==========================================
+ Hits         2137     2139       +2     
  Misses       2409     2409              
  Partials      221      221

Impacted Files	Coverage Δ
pkg/skaffold/deploy/kubectl/version.go	0% <0%> (ø)	⬆️
pkg/skaffold/deploy/kubectl.go	52.12% <100%> (ø)	⬆️
pkg/skaffold/deploy/kustomize.go	34.61% <50%> (+1.72%)	⬆️

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