Explicity disable dualstack for win overlay

[jsturtevant]

Reason for PR:

1.21 broke win overlay with dualstack: kubernetes/kubernetes#100966

The kubeadm tests are broken becuase of this:
https://testgrid.k8s.io/sig-windows-master-release#kubeadm-windows-gcp-k8s-stable

Issue Fixed:

Issue #

Requirements

• Sqaush commits
• Documentation
• Tests

Notes:

/assign @marosset @neolit123

[k8s-ci-robot]

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[neolit123]

given this is a breaking change in kube-proxy we should be fixing it in a 1.21 patch release?
to me it seems we should wait for that, instead of toggling off the feature gate.

[jsturtevant]

agree they should be fixed in a patch release, but win overlay isn't supported with dualstack either way. While waiting for the patch release I would rather have the tests running to catch other issues that might be introduced

[neolit123]

ok, understood.
/lgtm
/hold

cancel the hold if you think this should merge now.

[jsturtevant]

PR to for fixing the patch: kubernetes/kubernetes#101047
Issue to track rolling this back: #148
/hold cancel