Add assertion for IPv4 check in verify settings

[Citrullin]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Installation on IPv6 only nodes fails, because of an IPv4 assertion.
Is needed to run kubespray for IPv6 only nodes.

Special notes for your reviewer:
All nodes have to IPv6 only.

Does this PR introduce a user-facing change?:

Add assertion for IPv4 check in verify settings (to allow IPv6 deployments)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Citrullin / name: Philipp Blum (1c60a49)

[k8s-ci-robot]

Hi @Citrullin. Thanks for your PR.

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[oomichi]

/cc @oomichi

[Citrullin]

That does the job. Since there are also some local legacy IPs, I guess this should work just as it did before, while fixing the issue for IPv6.

[oomichi]

Thanks for updating, new one is much better.
just few comments.

[oomichi]

Thanks for updating.

/ok-to-test
/approve

[floryut]

@Citrullin Thank you for the update and the PR 🙇
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Citrullin, floryut, oomichi

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