Add permissions to cluster autoscaler to get statefulsets

[carlossg]

Otherwise getting error

User system:serviceaccount:kube-system:cluster-autoscaler cannot get statefulsets.apps in the namespace xxx. (get statefulsets.apps yyy)

[k8s-ci-robot]

Hi @carlossg. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[chrislovecnm]

/lgtm
/ok-to-test

[chrislovecnm]

AWESOME

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrislovecnm

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue.