Allow for specifying automountServiceAccountToken on cluster-autoscaler service account

[joshuastern]

No description provided.

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[joshuastern]

/assign @gjtempleton

[gjtempleton]

Hey,

Thanks for the PR!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gjtempleton, joshuastern

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