Added a main.yml in 'vars' directory to tell it is better to override using host or group vars.
Merge pull request #87 from Sysnove/defaults

Defaults
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).