Update rbac.yaml to avoid "Failed to watch" error

[wangchen615]

This is to resolve and close issue #271 .

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[wangchen615]

/assign @Huang-Wei

[denkensk]

/ok-to-test

[denkensk]

/lgtm
Thanks @wangchen615

[Huang-Wei]

@wangchen615 the root cause is the RBAC rules applied to the secondary scheduler doesn't fully "copy" the ones applied to default scheduler, in particular, access to configmap "extension-apiserver-authentication". This was fixed in the upstream by creating a RoleBinding: kubernetes/kubernetes#72491

So I think we should follow the same way here, instead of imposing a direct configmap access.

I raised PR #272 earlier, could you verify if it works?

[wangchen615]

Ok, I will close this PR then.

same way here, instead of imposing a direct con

#272