genenerate x-kubernetes-patch-merge-key and x-kubernetes-patch-strategy

[jessesuen]

Summary

Kustomize 4 has finally has a mechanism to teach it how to SMP custom resources. See:

• https://kubectl.docs.kubernetes.io/references/kustomize/kustomization/openapi/
• Strategic merge support for CRDs kubernetes-sigs/kustomize#2825
• More extensible kustomize merging support kubernetes-sigs/kustomize#2339
• https://github.com/kubernetes-sigs/kustomize/blob/master/examples/customOpenAPIschema.md

In order for kustomize to patch CRDs properly, we need to publish openAPI schema containing the following metadata in the Rollout CRD definitions.

• x-kubernetes-patch-merge-key
• x-kubernetes-patch-strategy

This will lower the barrier of entry to Rollouts and cause less surprising behavior.

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[huikang]

@jessesuen , I can pick this up; please assign it to me. Thanks.

[jessesuen]

Thanks @huikang !