Update the daemonset controller to understand upstream admission config format

[deads2k]

The daemonset controller patch that is optimizing the pods being created by preventing the creation of pods that it knows will fail. The "PodNodeSelector" (the upstream one) admission plugin has a config that doesn't seem to match the "normal" flow. We need to update the controller config parser to find the value.

It'll be in vendor/k8s.io/kubernetes/cmd/kube-controller-manager/app/patch_flags.go after #18989 lands.

@mfojtik @tnozicka @aveshagarwal @sjenning fyi

[openshift-bot]

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[tnozicka]

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