Remove kubeadm config endpoints

[Alvaro-Campesino]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This PR cleans the kubeadm-config configmap from information of etcd-nodes that are no longer present. This avoids issues when trying to rejoining this nodes

Which issue(s) this PR fixes:

Fixes #8235

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Cleanup kubeadm-config cm by removing etcd nodes endPoints no longer valid

Fixed the issues I caused before when I forgot to remove some local variables from my own environment 

[k8s-ci-robot]

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[Alvaro-Campesino]

I am first going to remove the kubernetes.core.k8s module before rebasing

[cristicalin]

How does this relate to #8287 ?

[Alvaro-Campesino]

Hi @floryut I have added a new module in the plugins section named kube_info I thought this was cleaner than changing the already existing one and adding a info option somewhere.

I needed to fetch information from k8s and this was the best way to avoid using command and shell. I am afraid this may open some discussions, but in the end I think it is useful and can contribute to a more readable code in the project.

Please post me any doubt or proposal you have.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Alvaro-Campesino
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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

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/close

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