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kubeadm init: skip checking cri socket in preflight checks
**What this PR does / why we need it**:
`kubeadm init` does not need to require `dockershim.sock` to be present.
Remove the check for `dockershim.sock`.
xref #55055
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixeskubernetes/kubeadm#657
**Special notes for your reviewer**:
/area kubeadm
/kind bug
/assign @luxas
/cc @kubernetes/sig-cluster-lifecycle-pr-reviews
**Release note**:
```release-note
kubeadm init: skip checking cri socket in preflight checks
```
d4064ac3cc