Merge pull request #7 from ceph/wip-list-distros

Add ability to list distros/versions with 'downburst list'
RBD backend support for downburst.

Definitely needs some cleanup but working. Set in yaml via:

ceph-cluster-name:
ceph-cluster-monitors:
ceph-cluster-user:
ceph-cluster-secret:
rbd-disks:
rbd-disks-size:

Other than cleanup it also needs readme added.

user/secret is optional. It uses no auth of not specified.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Use downburst pool of same name of vm if it exists.

Signed-off-by: Sandon Van Ness <sandon@inktank.com>
Merge branch 'wip-rbd'