/etc/hosts with static addresses for a list of hostgroups.
hosts_populate_iface: Lookup the host IP using this network interface, default
hosts_populate_openstack_groups: List of openstack groups, hosts from these groups will be included in
/etc/hosts. In practice this will probably work with non-openstack groups too.
hosts_populate_regex_alias: Include a host alias, defined by the first
(group)in this regex.
Warning: This role requires full control of