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
```
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Dimitri Mitropoulos 2019-01-06 16:32:55 -05:00 committed by GitHub
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@ -7,7 +7,7 @@ In this lab you will delete the compute resources created during this tutorial.
Delete the controller and worker compute instances: Delete the controller and worker compute instances:
``` ```
gcloud -q compute instances delete \ gcloud -q compute instances delete --zone $(gcloud config get-value compute/zone) \
controller-0 controller-1 controller-2 \ controller-0 controller-1 controller-2 \
worker-0 worker-1 worker-2 worker-0 worker-1 worker-2
``` ```