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071844e35f
Automatic merge from submit-queue (batch tested with PRs 38445, 40292)
kubeadm: Secure apiserver -> kubelet communication and set storage backend to etcd3
**What this PR does / why we need it**:
Switch storage backend to etcd3
Writes ca.crt down to disk so we can set `--client-ca-file=/etc/kubernetes/ca.crt` for the kubelet.
Adds --kubelet-client-{certificate,key} to the apiserver args and make it allowed to access the kubelets
In some cases the `path` dependency is switched to `filepath`
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:
fixes https://github.com/kubernetes/kubeadm/issues/118
fixes https://github.com/kubernetes/kubeadm/issues/129
**Special notes for your reviewer**:
This PR is should make it possible to secure the apiserver -> kubelet communication.
**Release note**:
```release-note
NONE
```
@pires @mikedanese @andrewrynhard @liggitt @deads2k