pre-pull images that are not part of the build about kind HOT 4 CLOSED

etcd, pause and coredns versions are hardcoded in a constants file. their version is bumped on each release. the control plane version in 1.11 was mapped to the stable-1.11 endpoint, in 1.12 we moved to stable-1 (this needs a cherry pick enhancement).

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running in the default image:

root@b0816c5f4071:/# kubeadm config images list
k8s.gcr.io/kube-apiserver-amd64:v1.11.3
k8s.gcr.io/kube-controller-manager-amd64:v1.11.3
k8s.gcr.io/kube-scheduler-amd64:v1.11.3
k8s.gcr.io/kube-proxy-amd64:v1.11.3
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd-amd64:3.2.18
k8s.gcr.io/coredns:1.1.3

Checking upstream, these are ~ mapped by kubernetes version, not config, so we should be able to pre-pull them at build time easily, we probably want to pull .*etcd.* and .*pause.*

ref: https://github.com/kubernetes/kubernetes/blob/69da1f83995f0fa1e555dfacef9e97abc63b9333/cmd/kubeadm/app/constants/constants.go#L376

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Excellent, thanks! For the control plane in docker and bazel builds we have locally built images, but not in apt. For all of them we don't have pause, DNS, etcd since those aren't built in k8s.

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Fixed in #89, will push new images.

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