Rename roles' names

I added a 'ceph-' prefix to all the roles related to Ceph. Since we are
about to push the roles into the Ansible Galaxy that will be easier when
we want to use these roles into a larger environement with other roles.

Fixes: #94

Signed-off-by: Sébastien Han <sebastien.han@enovance.com>
Merge pull request #95 from leseb/wip-rename-common

Rename roles' names
Added some keys to be able to have information from OSD nodes.
Updated group names according to Sysnove name layout.
Finished renaming server groups according to Sysnove inventory.
Added firewall configuration.
Accept Ceph-clients in shorewall rules
Added firewall tag
Whitelist
Allow devices to be partition instead of disks (used for some physical servers with a sigle disk for system and storage).