Comment 2 for bug 1762870

Trying to sort on 'fault' results in a 400 as I'd expect:

stack@rocky:~$ curl http://162.253.55.188/compute/v2.1/servers?sort_key=fault -H "x-auth-token: $TOKEN" | python -m json.tool
  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed
100 875 100 875 0 0 77860 0 --:--:-- --:--:-- --:--:-- 79545
{
    "badRequest": {
        "code": 400,
        "message": "Invalid input for query parameters sort_key. Value: fault. u'fault' is not one of ['access_ip_v4', 'access_ip_v6', 'auto_disk_config', 'availability_zone', 'config_drive', 'created_at', 'display_description', 'display_name', 'host', 'hostname', 'image_ref', 'instance_type_id', 'kernel_id', 'key_name', 'launch_index', 'launched_at', 'locked_by', 'node', 'power_state', 'progress', 'project_id', 'ramdisk_id', 'root_device_name', 'task_state', 'terminated_at', 'updated_at', 'user_id', 'uuid', 'vm_state', 'architecture', 'cell_name', 'cleaned', 'default_ephemeral_device', 'default_swap_device', 'deleted', 'deleted_at', 'disable_terminate', 'ephemeral_gb', 'ephemeral_key_uuid', 'id', 'key_data', 'launched_on', 'locked', 'memory_mb', 'os_type', 'reservation_id', 'root_gb', 'shutdown_terminate', 'user_data', 'vcpus', 'vm_mode']"
    }
}
stack@rocky:~$