Add --cluster-domain flag to make service FQDN configurable

[kincoy]

Add --cluster-domain flag (default: cluster.local) to support clusters with non-default DNS domains

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kincoy
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[k8s-ci-robot]

Hi @kincoy. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[justinsb]

We do have #477, which I think is similar and is just waiting on a gofmt. I do like that you added docs, but I feel we should let #477 go in first (unless you and @framsouza are collaborating on this PR?)

[justinsb]

/ok-to-test

[justinsb]

/hold for figuring out overlap with #477

[kincoy]

@justinsb I wasn't aware of #477! Happy to wait for it to merge and rebase this PR to only include the docs/configuration.md update. Thanks!

[k8s-ci-robot]

PR needs rebase.

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