Guest filesytem parity

We propose a blueprint to help openstack perform actions with/on images in a uniform manner. This would mean unifying (or abstracting) the different methods via ephemeral volumes are created, mounted, and modified (ie network injection). This is useful since not all methods are available on all operating systems (most importantly rhel6 lacks qemu-nbd but has guestfs and vice versa). We would also like to propose a possible solution to the long term problem of unifying all image modification and introspection methods into one utility, if this makes sense for the community.