Automatic merge from submit-queue (batch tested with PRs 63322, 64718, 64708, 64775, 64777). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Fix kubeadm for v1alpha1 configs
Signed-off-by: Chuck Ha <ha.chuck@gmail.com>

**What this PR does / why we need it**:
This PR allows v1alpha1 configurations to still work when running `kubeadm init`.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes kubernetes/kubeadm#884

**Special notes for your reviewer**:

```release-note
NONE
```