Automatic merge from submit-queue (batch tested with PRs 52007, 52196, 52169, 52263, 52291)

kubeadm: Enable certificate rotation

**What this PR does / why we need it**:

Enables cert rotation as planned for the v1.8 cycle in https://github.com/kubernetes/kubeadm/issues/386
Can now be done as everything's in place in the code now that beta.1 is released with all the necessary features (Kubelet clientcert rotation now beta, woot!)

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

fixes: https://github.com/kubernetes/kubeadm/issues/386

**Special notes for your reviewer**:

This file does _ONLY_ affect the kubeadm e2e CI.
What will actually end up in the debs/rpms is going into kubernetes/release right before v1.8 is released (due to how those scripts work, not optimal :/ )

**Release note**:

```release-note
kubeadm: Enable kubelet client certificate rotation
```
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