This change enables 'zero touch' provisioning of the overcloud hosts. Following
power on of the nodes, they are discovered by Ironic inspector running on the
seed node and registered with the seed node's instance of Ironic. Once discovered
and inspected, Kayobe uses the seed's Ironic inventory to populate its own Ansible
inventory. From here, we can fill out host variables for Bifrost to use when
provisioning the nodes. Finally, we configure Kolla Ansible's inventory.