[3.4] Complete backport of OWNERS file

[thedtripp]

#16367

[ahrtr]

LGTM

Thank you!

[ivanvc]

Hi @thedtripp, thanks for your pull request. I see that there's still a mention of the MAINTAINERS file in the README.md:

etcd/README.md

Line 174 in 1956a47

A security vulnerability can be reported as an issue, however, GitHub and mailing lists may NOT always be an appropriate place for reporting vulnerabilities. In that case, please reach out to the project [MAINTAINERS](https://github.com/etcd-io/etcd/blob/master/MAINTAINERS) to first discuss the vulnerabilities with them and take necessary action per such discussion.

And there's also the MAINTAINERS_RULE.md file, which may be irrelevant with OWNERS (https://github.com/etcd-io/etcd/blob/1956a4783e316ed4b9f64e67d4451e5ce50377a5/MAINTAINERS_RULES.md). But I'm not sure what others think.

[thedtripp]

Hi @thedtripp, thanks for your pull request. I see that there's still a mention of the MAINTAINERS file in the README.md:

etcd/README.md

Line 174 in 1956a47

A security vulnerability can be reported as an issue, however, GitHub and mailing lists may NOT always be an appropriate place for reporting vulnerabilities. In that case, please reach out to the project [MAINTAINERS](https://github.com/etcd-io/etcd/blob/master/MAINTAINERS) to first discuss the vulnerabilities with them and take necessary action per such discussion.

And there's also the MAINTAINERS_RULE.md file, which may be irrelevant with OWNERS (https://github.com/etcd-io/etcd/blob/1956a4783e316ed4b9f64e67d4451e5ce50377a5/MAINTAINERS_RULES.md). But I'm not sure what others think.

Fixed. Let me know if anything else needs attention.

[jmhbnz]

LGTM - Thanks for finishing this off @thedtripp

[ivanvc]

LGTM. Thanks, Daniel.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ahrtr, ivanvc, jmhbnz, thedtripp
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[ivanvc]

/retitle [3.4] Complete backport of OWNERS file