KEP-3983: update the beta requirements

[sohankunkerkar]

We already have a method to query the Kubelet's full effective configuration, so there's no need to implement that API. We can simply use this query: kubectl get --raw "/api/v1/nodes/192.168.1.16/proxy/configz"

• One-line PR description:

• Issue link: Add support for a drop-in kubelet configuration directory #3983

• Other comments:

[k8s-ci-robot]

Hi @sohankunkerkar. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sohankunkerkar
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[haircommander]

/ok-to-test
/lgtm

[kannon92]

/assign @mrunalp @dchen1107