Update labels when deploying to namespace other than default

[dgageot]

Fixes #1112

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

[codecov-io]

Codecov Report

Merging #1115 into master will decrease coverage by 0.01%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #1115      +/-   ##
==========================================
- Coverage   42.97%   42.96%   -0.02%     
==========================================
  Files          74       74              
  Lines        3402     3403       +1     
==========================================
  Hits         1462     1462              
- Misses       1800     1801       +1     
  Partials      140      140

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/cmd.go	0% <0%> (ø)	⬆️
pkg/skaffold/deploy/labels.go	0% <0%> (ø)	⬆️
pkg/skaffold/deploy/kustomize.go	36.23% <0%> (ø)	⬆️
pkg/skaffold/deploy/kubectl.go	51.21% <100%> (ø)	⬆️

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[balopat]

LGTM