refactor: OptionsBuilder works on kops.Cluster

[justinsb]

Previously it worked on ClusterSpec, but that means we can't read the
labels or annotations. We want to use those labels/annotations to
experiment with new cloud providers (e.g. bare metal) before adding
this to the API.

Introduce generics so we also get type-safety.

[justinsb]

I think operation error ec2imds: GetRegion, canceled, context deadline exceeded is unrelated (???)

/retest

[hakman]

/test pull-kops-e2e-cni-cilium-eni
/test pull-kops-e2e-cni-cilium-etcd

[hakman]

/test pull-kops-e2e-cni-kuberouter
/test pull-kops-e2e-cni-cilium
/test pull-kops-e2e-cni-amazonvpc
/test pull-kops-e2e-cni-flannel

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[justinsb]

/retest

I am confused as to how this could be failing when initializing DNS, but other jobs are not failing.... retesting one more time to validate my assumptions!

[rifelpet]

I think the imds error is legitimate and a result of #16647 but I'm not sure why it is happening inconsistently.

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/retest

[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-cilium-ipv6	29d6fd8	link	false	/test pull-kops-e2e-cni-cilium-ipv6
pull-kops-e2e-cni-calico-ipv6	29d6fd8	link	false	/test pull-kops-e2e-cni-calico-ipv6

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