Revert "Multi node config"

[BenTheElder]

Reverts #147

this PR was incompatible with https://github.com/kubernetes-sigs/kind/pull/164/commits, I'd rather merge that and get onto fixing up rebase etc.

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[krzyzacy]

/pony shrug
/lgtm

[k8s-ci-robot]

@krzyzacy:

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/pony shrug
/lgtm

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[neolit123]

this PR was incompatible with https://github.com/kubernetes-sigs/kind/pull/164/commits

i think the action PR was supposed to merge after the multi-node PR.
might have been better to allow @fabriziopandini to rebase.

[BenTheElder]

@neolit123 perhaps, trying to unclog the backlog though. I also have a number of not yet PRed changes that we should get in, besides the outstanding backlog. In either case I will be filing more PRs to the config format before the next release (IE today).

[neolit123]

kk, sounds good.