Allow cluster autoscaler addon to read statefulsets

[johanhubens]

Cluster autoscaler addon was unable to list/watch statefulsets when RBAC is enabled because it wasn't granted permission. fixes #3363

[k8s-ci-robot]

Hi @johanhubens. Thanks for your PR.

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[johanhubens]

/assign @zmerlynn

[justinsb]

/lgtm

Thanks @johanhubens

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb

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[chrislovecnm]

/retest

[chrislovecnm]

/ok-to-test

[k8s-github-robot]

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

[k8s-github-robot]

Automatic merge from submit-queue