kubeadm setup: enhance retry with etcd error ignore

[shaleenbathla]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change

/kind bug

/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Fixes this error during retry:
[preflight] Some fatal errors occurred:
[ERROR FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
[preflight] If you know what you are doing, you can make a check non-fatal with --ignore-preflight-errors=... error: error execution phase preflight: preflight checks failed To see the stack trace of this error execute with --v=5 or higher

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: shaleenbathla
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[k8s-ci-robot]

Hi @shaleenbathla. Thanks for your PR.

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[shaleenbathla]

@VannTen please review