chore: disable non-expiring service account tokens
chore: disable non-expiring service account tokens

Signed-off-by: Martin Linkhorst <00a45ae45ce1c1db524be4a278caee0b3e409246@zalando.de>

zalando-incubator/kubernetes-on-aws,zalando-incubator/kubernetes-on-aws,zalando-incubator/kubernetes-on-aws