Merge Jib feature-branch

[balopat]

This PR is only to keep an eye on the jib_skaffold feature branch, and when it's ready, to merge it.

[codecov-io]

Codecov Report

Merging #1063 into master will increase coverage by 1.38%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##           master    #1063      +/-   ##
==========================================
+ Coverage   42.96%   44.35%   +1.38%     
==========================================
  Files          74       84      +10     
  Lines        3403     3709     +306     
==========================================
+ Hits         1462     1645     +183     
- Misses       1801     1909     +108     
- Partials      140      155      +15

Impacted Files	Coverage Δ
pkg/skaffold/build/local/local.go	56.81% <0%> (-5.69%)	⬇️
pkg/skaffold/runner/runner.go	50.2% <0%> (-1.28%)	⬇️
pkg/skaffold/util/util.go	49.09% <100%> (+3.99%)	⬆️
pkg/skaffold/jib/jib_gradle.go	100% <100%> (ø)
pkg/skaffold/build/local/jib.go	100% <100%> (ø)
pkg/skaffold/util/wrapper_unix.go	100% <100%> (ø)
pkg/skaffold/build/local/jib_maven.go	35% <35%> (ø)
pkg/skaffold/build/local/jib_gradle.go	42.1% <42.1%> (ø)
pkg/skaffold/jib/jib_maven.go	83.33% <83.33%> (ø)
pkg/skaffold/jib/jib.go	89.65% <89.65%> (ø)
... and 11 more

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[loosebazooka]

Could we merge this and start working against master?