This change adds the aforementioned label to the list of ignored labels
in the AWS nodegroupset processor. This change is being made in response
to the addition of this label by the aws-ebs-csi-driver. This label will
eventually be deprecated by the driver, but its use will prevent AWS
users from properly balancing similar nodes. Also adds unit test for the
AWS processor.
ref: https://github.com/kubernetes/autoscaler/issues/3230
ref: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/issues/729
bsoghigian
Michael McCune