Disable loopback0 interface on Metalbox

[fzakfeld]

As explained in osism/python-osism#1585 and osism/openstack-ironic-images#114 we'd like to do any bare metal deployment related operations including the IPA callback via the OOB network.

For this, we need to prevent the metalbox from having the fd33:fd0e:2aee::42/128 address on loopback0. As we don't need it at all, it would be easiest to remove it entirely.

Instead we will configure it as a /64 network on the OOB interface on the metalbox:

- ip_address:
    tenant: scaleup
    address: fd33:fd0e:2aee::42/64
    assigned_object:
      name: vlan1006
      device: metalbox

Unfortunately the loopback0 for the metalbox host is statically defined in the metalbox upstream enviroment, e. g. in inventory/group_vars/all/network.yml and environments/manager/group_vars/all/network.yml. As a workaround I can modify the environment but please provide a way for this via Netbox