yoga: xena merge

[priteau]

• Add defaults for cephadm_commands_{pre,post}
• Add documentation for Magnum in a Multinode
• Add geneve to multinode if ovn is enabled
• Fix multinode failures from seed misconfiguration

[markgoddard]

Rocky 9 failing after update to interfaces role in kayobe:

  stderr: |-
    nohup: ignoring input
    Error: 'breth1' is not an active connection.
    Error: no active connection provided.
  stderr_lines: <omitted>
  stdout: |-
    Connection 'ens3' successfully deactivated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/2)
    Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/4)
    Connection successfully activated (master waiting for slaves) (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/5)
    Waiting for interfaces to become active and have a connected carrier
    Interface breth1 failed to become active and have a connected carrier

[markgoddard]

Not related to this PR though.