Add Cinder to Quickstack

There is cinder_controller class which is now included from
nova_network/controller.pp.

The cinder_storage is not included anywhere yet and needs to be
manually addded in Foreman to a node. We'll want to create a hostgroup
for it.
Script for testing cinder on loop device volumes

Sets up a loop device and creates cinder-volumes group.

*This is not meant for production use, it's for testing only.*
Production machines should be set up with cinder-volumes group backed
by real drives.