XXX: trying to add support for additional disks. DO NOT MERGE.

Error on vagrant up is:
Call to virDomainCreateWithFlags failed: Failed to open file
'/var/lib/libvirt/images/gluster_puppet-vdc.qcow2': No such file or
directory

Error on 1.5.4 is:
Error while attaching new device to domain. Call to
virDomainAttachDeviceFlags failed: Operation not supported: persistent
attach of device 'filesystem' is not supported