Resolves warning 2 from #2471.

As per https://github.com/kubernetes/cloud-provider/issues/12 the
ClusterID requirement was never really followed through on, so the
flag is probably going to be removed in the future.

One side-effect of this is that the core k8s cloud-controller-manager
also wants to watch nodes, and needs RBAC to do so.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>