WIP Disable DHCP on cilium pod ENIs on Flatcar

[rifelpet]

Discovered this suggestion while troubleshooting the flaky cilium-eni grid jobs.

[k8s-ci-robot]

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[hakman]

/test pull-kops-e2e-cni-cilium-ipv6

[k8s-ci-robot]

@rifelpet: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-cni-cilium-eni	9fc828c	link	true	/test pull-kops-e2e-cni-cilium-eni
pull-kops-e2e-cni-cilium-etcd	9fc828c	link	true	/test pull-kops-e2e-cni-cilium-etcd
pull-kops-e2e-k8s-gce-ipalias	9fc828c	link	true	/test pull-kops-e2e-k8s-gce-ipalias

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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