Dimitri Mitropoulos c906443407 Add zone to cleanup command ...

When I ran the command as described in the tutorial I got the following:

```
ERROR: (gcloud.compute.instances.delete) Underspecified resource [controller-0, controller-1, controller-2, worker-0, worker-1, worker-2]. Specify the [--zone] flag.
```
I believe I do have gcloud set up correctly (although, perhaps I'm wrong)

```bash
> gcloud config list compute/zone
[compute]
zone = us-central1-a
```

2019-01-06 16:32:55 -05:00

..

images

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01-prerequisites.md

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02-client-tools.md

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03-compute-resources.md

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04-certificate-authority.md

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05-kubernetes-configuration-files.md

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06-data-encryption-keys.md

update docs

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07-bootstrapping-etcd.md

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08-bootstrapping-kubernetes-controllers.md

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09-bootstrapping-kubernetes-workers.md

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10-configuring-kubectl.md

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11-pod-network-routes.md

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12-dns-addon.md

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13-smoke-test.md

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14-cleanup.md

Add zone to cleanup command

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