remove rkt reference

[hiramf]

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[sftim]

Hi @hiramf

Thanks for this PR.

Did you want to remove all the rkt references? If you did, also consider changing / removing:

• https://k8s.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/
• https://k8s.io/docs/tutorials/kubernetes-basics/create-cluster/cluster-intro/
• https://kubernetes.io/docs/reference/glossary/?all=true#term-rkt

/lgtm

[zacharysarah]

RIP rkt 🚀

@hiramf +1 to @sftim's comment. If you remove other rkt references, please bundle them into a single PR. 👍

/approve

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