WIP: use node-ipam-controller in ipv6 metal tests

[justinsb]

• tests: add test for bare-metal with ipv6
• metal: simple IPAM for IPv6
• WIP: use node-ipam-controller

[k8s-ci-robot]

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[k8s-ci-robot]

@justinsb: 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-flannel	cb6e290	link	true	/test pull-kops-e2e-cni-flannel
pull-kops-e2e-gce-cni-calico	cb6e290	link	true	/test pull-kops-e2e-gce-cni-calico
pull-kops-e2e-gce-cni-kindnet	cb6e290	link	true	/test pull-kops-e2e-gce-cni-kindnet
pull-kops-e2e-k8s-aws-amazonvpc-u2404	cb6e290	link	true	/test pull-kops-e2e-k8s-aws-amazonvpc-u2404

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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[k8s-ci-robot]

PR needs rebase.

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