Merge pull request #42196 from zmerlynn/nuke-kube-up-aws

Automatic merge from submit-queue

AWS: Kill bash deployment

c.f. #38772, #42194 and https://k8s-testgrid.appspot.com/google-aws#aws

cluster/kube-up.sh with KUBERNETES_PROVIDER=aws has been broken on 1.6
for a couple of months now. No one is supporting it. Nuke.

```release-note
Deployment of AWS Kubernetes clusters using the in-tree bash deployment (i.e. cluster/kube-up.sh or get-kube.sh) is obsolete. v1.5.x will be the last release to support cluster/kube-up.sh with AWS. For a list of viable alternatives, see: http://kubernetes.io/docs/getting-started-guides/aws/ 
```