With OSC 4.0.0 we could now use the --boot-from-volume option
to create a volume-backed server from the provided image. However,
that option leaves the created root volume around since
delete_on_termination defaults to false in the API. So while we
could use that option and convert from nova boot to openstack
server create, it would mean we'd have to find and manually delete
the created volume after the server is created, which is more work
than it's worth to implement the TODO so just remove it.