Update the KEP to call out why we don't plan to create groups for sha…

[vinayakankugoyal]

…red access to certificate files.

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[neolit123]

we had a discussion on slack with @vinayakankugoyal . he found that we can omit some of the original planned user/groups in the initial KEP.

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: neolit123, vinayakankugoyal

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