Add information about auto-bootstrapped ClusterRoles for CSR approving

[luxas]

This is a...

• Feature Request
• Bug Report

Problem:

The changes in kubernetes/kubernetes#49284 should be documented

Proposed Solution:

I'm gonna send a PR after code freeze :)

Page to Update:
http://kubernetes.io/...

v1.8

@liggitt asked for

please open a corresponding PR against https://github.com/kubernetes/kubernetes.github.io/blob/release-1.8/docs/admin/authorization/rbac.md#other-component-roles (the 1.8 branch) when the names are finalized.

when you open the doc PR, also update the TLS bootstrapping page to give specific examples of the roles you would need to bind to enable bootstrapping

👍

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