support generators and transformers plugins in `kubectl kustomize` and `kubectl -k`

[Liujingfang1]

Enhancement Description

• One-line enhancement description (can be used as a release note):
  support generators and transformers plugins through plugins in kubectl kustomize and kubectl -k

• Kubernetes Enhancement Proposal: (link to kubernetes/enhancements file, if none yet, link to PR) https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/20190318-kustomize-generators-transformers.md

• Primary contact (assignee):
  Liujingfang1, monopole

• Responsible SIGs:
  /sig-cli

• Enhancement target (which target equals to which milestone): 1.15

  • Alpha release target (x.y) 1.15

This is to revendor Kustomize into kubectl with generator and transformer plugin support.

Please to keep this description up to date. This will help the Enhancement Team track efficiently the evolution of the enhancement

[Liujingfang1]

/sig cli

[Liujingfang1]

/kind feature

[mrbobbytables]

/milestone v1.15
/stage stable

[justaugustus]

/assign @Liujingfang1 @monopole

[craiglpeters]

@Liujingfang1 and @monopole we're doing a KEP review for enhancements to be included in the Kubernetes v1.15 milestone. After reviewing your KEP, it's currently missing test plan and graduation criteria which are required information per the KEP Template. Please update the KEP to include the required information before the Kubernetes 1.15 Enhancement Freeze date of 4/30/2019.

[Liujingfang1]

@mrbobbytables I updated it to Alpha release in 1.15.