KEP 2008: Update KEP to reflect current code changes

[adrianreber]

During the discussion to graduate this KEP from Alpha to Beta certain changes were requested. This updates the KEP to reflect that all necessary changes have been implemented.

Also the GA graduation requirement "containerd support" has been merged and is now also mentioned in the KEP.

• One-line PR description: reflect current code changes

• Issue link: https://github.com/kubernetes/enhancements/issues/2008

[k8s-ci-robot]

Hi @adrianreber. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: adrianreber Once this PR has been reviewed and has the lgtm label, please assign dchen1107 for approval. For more information see the Kubernetes Code Review Process.

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[rst0git]

LGTM