Code review comment for lp://staging/~allenap/gwacl/destroy-hosted-service

I think we should fix DestroyDeployment by doing this first: https://code.launchpad.net/~rvb/gwacl/fix-destroydeploy2/+merge/173095

Since the deployment used in the tests does not contain VMs, this branch will probably work as is, even with that change.