---
upgrade:
  - |
    Add ``choices`` parameter to config options. Invalid values will be
    rejected when first accessing them, which can happen in the middle of
    deployment.

    =================================  ================
                 Option                     Choices
    =================================  ================
    [DEFAULT]/auth_strategy            keystone, noauth
    [glance]/auth_strategy             keystone, noauth
    [glance]/glance_protocol           http, https
    [neutron]/auth_strategy            keystone, noauth
    [amt]/protocol                     http, https
    [irmc]/remote_image_share_type     CIFS, NFS
    [irmc]/port                        443, 80
    [irmc]/auth_method                 basic, digest
    [irmc]/sensor_method               ipmitool, scci
    =================================  ================