Wip rgw

Working on Ubuntu 12.04.
Made a quick test on CentOS 6.4, seemed to work but probably needs more testing. 

Next thing is to add an attribute called: [ceph][radosgw][install_admin_key] (or something similar) to false by default to be able to copy the admin key to the radosgw. This will avoid to add --id radosgw.hostname for every radosgw-admin command.