Docker should not be the default runtime

[AngerM-DD]

With k8s 1.20 Docker support as the CRI is being deprecated. The default should probably be changed to containerd and a warning placed for users creating clusters with docker that it will not be supported in the future.

see: https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md#deprecation

[hakman]

Thanks for the news. We will discuss how to notify the users and switch to containerd by default in the near future.

[bmelbourne]

/close

[k8s-ci-robot]

@bmelbourne: Closing this issue.

In response to this:

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.