KEP-4969: Cluster Domain Downward API

[nightkr]

- One-line PR description: Initial KEP draft

• Issue link: https://github.com/kubernetes/enhancements/issues/4969

• Other comments:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: nightkr Once this PR has been reviewed and has the lgtm label, please assign mikezappa87 for approval. For more information see the Kubernetes Code Review Process.

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Needs approval from an approver in each of these files: - **[keps/sig-network/OWNERS](https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @nightkr. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[adrianmoisey]

/ok-to-test

[k8s-ci-robot]

@nightkr: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-enhancements-verify	a878d62e65a7a240735eb85567f5586e5b22b32c	link	true	/test pull-enhancements-verify

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).