Import current set of roles

- Common: just install some basics and setup the environment
    Tested on Debian (7), configuration present for Debian, Ubuntu,
    RedHat Enterprise (6.x) and CentOS (6.x)

- Libvirt: setup configuration for hosting virtual machines using libvirt.
    Plan is to host the images/data on a gluster-cluster, so we can get
    live migration/failover (in the future)

- Gluster: Setup glusterfs storage cluster.
    WARNING: This role/play will wipe/format configurured disks without
    any further warnings. Make sure you check the configuration.
Example hosts file for the libvirt and gluster roles