Delete RDP firewall rule during kube-down.

[pjh]

/kind cleanup

This rule is only created if the cluster has one or more Windows nodes, but delete-firewall-rules() ignores firewall rule arguments that do not exist so it's safe to always attempt to delete this rule.

NONE

[k8s-ci-robot]

Hi @pjh. Thanks for your PR.

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[pjh]

/assign yujuhong

[yujuhong]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pjh, yujuhong

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