Start of ceph_facts (tested on bobtail)

This module currently dumps out facts for the ceph distributed object store.

- 'quorum_status' information (effectively 'mon' information)
- 'osd' information
    - Also the osd tree
- 'mds' information
- 'rados df' information

it assumes that the machine that is being logged into has the correct ceph
authentication/permissions setup

It's here, though I'm not sure how much use this will be to others (I'd imagine anyone looking at using ceph to back openstack would be interested in this)