Add update exclusion to kubernetes.repo

[iamwillbar]

Add an update exclusion for kubelet, kubeadm, and kubectl in the CentOS to mirror the Ubuntu, Debian, or HypriotOS instructions.

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[sftim]

This looks like it builds on #9670

/sig cluster-lifecycle

[sftim]

/approve

Will wait for technical /lgtm from SIG Cluster Lifecycle.

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[neolit123]

just to clarify, exclude here would skip updates of the listed packages during distro upgrade?
and then the user must always pass --disableexcludes on yum install?

looks like our upgrade guide already has the flag everywhere:
https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/

[iamwillbar]

@neolit123 yes, that's my understanding. In fact, just below this section there is a yum install --disableexcludes=kubernetes which is what made me notice that there wasn't an exclusion in place to exclude.

[neolit123]

thanks for confirming.
/lgtm