Add RBAC in the example yaml file and document about node-problem-detector HOT 6 CLOSED

@Random-Liu I'm going to add node-problem-detector in kubemark using RBAC as we recently moved to RBAC in kubemark as well (kubernetes/kubernetes/#39349).
Once I get it working, I'll add a link to the PR here and it would be easier for you to then prepare example/readme.

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Cool, thanks a lot @shyamjvs

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@Random-Liu Is this still on? If yes, here's the example for the npd role-binding (the role already exists in bootstrapping, so needn't create) -> https://github.com/kubernetes/kubernetes/blob/master/test/kubemark/resources/manifests/addons/kubemark-rbac-bindings/npd-binding.yaml
And for authenticating npd, here are the 2 things that one needs to do:

1. Create a bearer token (that you can get by creating a serviceaccount for npd or just use default serviceaccount) or certificate or put static token in apiserver's token file (like here https://github.com/kubernetes/kubernetes/blob/master/test/kubemark/start-kubemark.sh#L90). Other authentication modes can be neglected unless required in special cases.
2. Make npd use kubeconfig with auth token/certificate created in the above step. Like here -> https://github.com/kubernetes/kubernetes/blob/master/test/kubemark/start-kubemark.sh#L250.

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