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remove misleading error message on image pulling
**What this PR does / why we need it**:
Actually all the images needed have already been cached locally already as we have pulled them using `crictl`/`docker` in the preflight checks.
The error here is misleading, which should be removed.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
xref kubernetes/kubeadm#1019
**Special notes for your reviewer**:
cc @kubernetes/sig-cluster-lifecycle-pr-reviews
**Release note**:
```release-note
kubeadm: remove misleading error message regarding image pulling
```
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