redirections (ie: 302 redirect) can work. This repair listing instances in
    Horizon.

  * Setup cloudkitty-processor on multiple controllers using coordination URL.

  * Explicitely choose the firewall type for Neutron agents.

    case if there's a borken drive in a swift cluster).

    fernet key "1" on each puppet run.
  * Nova default config on compute:
    - DEFAULT/use_cow_images = False.
    - preallocate_images = 'space'.
    - remove_unused_original_minimum_age_seconds = 604800 (one week).
  * Neutron default config:
    - service_plugins: add segments.
    - network_vlan_ranges = external (so, we use br-ex for the VLANs).

    prints on all consoles).

  * Fix cloudkitty's rabbitmq amqp_sasl_mechanisms.

    work properly.

    in Sid/Buster.

    mariadb 10.3.

Many tweaks, now setting-up br-ex with eth0 as port for compute and controller.