https://docs.openstack.org/api-ref/block-storage/v3/?expanded=update-a-volume-s-bootable-status-detail#update-a-volume-s-bootable-status https://github.com/openstack/cinder/blob/c29285e7dcda7f5300c5a3375294dfa4aeb56430/cinder/api/contrib/volume_actions.py#L307..L321