When writing ansible inventory files as yaml, we should be using add them under the children key per the official documentation: https://docs.ansible.com/ansible/latest/user_guide/intro_inventory.html#hosts-and-groups This is the first step to allowing groups of groups for an inventory. Change-Id: Id1e14d0364dd06af0371ca027031e46fb5f73e92 Signed-off-by: Paul Belanger <pabelanger@redhat.com>