Comment 1 for bug 1717598

The following reproduces (but produces an instance which I can't SSH in to; I had to capture the boot disk to discover this):

```
$ cat << EOF > cfg
bootcmd:
 - touch /tmp/cloud-init-works
EOF
gcloud compute instances create aa-$(date +%y%m%d-%H%M) --image daily-ubuntu-alan-1710-artful-v20170915a --image-project ubuntu-os-cloud-devel --metadata-from-file user-data=cfg
```