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kubeadm: reset: use crictl to reset containers
@luxas PTAL
Signed-off-by: Antonio Murdaca <runcom@redhat.com>
**What this PR does / why we need it**:
This patch makes kubeadm to try and reset containers using `crictl` first instead of docker. The reason is that kubeadm reset is ineffective with new container runtimes using the CRI (like CRI-O).
This patch uses `crictl` first and falls back to `docker` in case `crictl` isn't available.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Fix https://github.com/kubernetes/kubeadm/issues/508
**Special notes for your reviewer**:
**Release note**:
```release-note
kubeadm: reset: use crictl to reset containers
```
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