[investigation] Worker node fails to start on VirtualBox due to btrfs incompatibility

[deniseyu]

When deploying to bosh-lite in using the cluster manifest, the worker node will not start with the default configurations. The worker process errors due to an issue around mounting btrfs filesystem. (I have error logs on a different machine - will post later)

Workaround for now is to use overlay fs instead for VBox. To do so, include the storage-driver.yml ops file and --var storage_driver=overlay in the deployment script.