add host support for docker build

[wuxingzhong]

add host support from docker build

[tejal29]

@wuxingzhong Thank you for the PR.
Please review the "Making config changes" section in the DEVELOPMENT.md to fix the failing tests.

The code changes look good.

[codecov]

Codecov Report

Merging #5698 (4f56af8) into master (bf8685a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5698      +/-   ##
==========================================
+ Coverage   70.41%   70.43%   +0.01%     
==========================================
  Files         413      413              
  Lines       15946    15948       +2     
==========================================
+ Hits        11229    11233       +4     
+ Misses       3884     3883       -1     
+ Partials      833      832       -1     

Impacted Files	Coverage Δ
pkg/skaffold/schema/latest/config.go	58.82% <ø> (ø)
pkg/skaffold/docker/image.go	78.34% <100.00%> (+0.20%)	⬆️
pkg/skaffold/docker/parse.go	86.19% <0.00%> (-0.96%)	⬇️
pkg/skaffold/util/tar.go	56.00% <0.00%> (+5.33%)	⬆️

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[gsquared94]

@wuxingzhong I pushed the config version changes in a separate PR. I think you can simplify this PR back to only your set of changes (rebased on master HEAD).