Charms still render auth_uri which is deprecated for removal in Stein as of Queens

[Dmitrii Shcherbakov]

Charms still render auth_uri which is deprecated for removal in Stein as of Queens:

https://github.com/openstack/keystonemiddleware/blob/stable/queens/keystonemiddleware/auth_token/_opts.py#L51-L67

    cfg.StrOpt('auth_uri',
               deprecated_for_removal=True,
               deprecated_reason='The auth_uri option is deprecated in favor'
               ' of www_authenticate_uri and will be removed in the S '
               ' release.',
               deprecated_since='Queens',
               help='Complete "public" Identity API endpoint. This endpoint'
               ' should not be an "admin" endpoint, as it should be accessible'
               ' by all end users. Unauthenticated clients are redirected to'
               ' this endpoint to authenticate. Although this endpoint should'
               ' ideally be unversioned, client support in the wild varies.'
               ' If you\'re using a versioned v2 endpoint here, then this'
               ' should *not* be the same endpoint the service user utilizes'
               ' for validating tokens, because normal end users may not be'
               ' able to reach that endpoint. This option is deprecated in'
               ' favor of www_authenticate_uri and will be removed in the S'
               ' release.'),

See charmhelpers/contrib/openstack/templates/section-keystone-authtoken

[Liam Young (gnuoy)]

I think it makes sense to have one unified template fragment for keystone auth token which works for all openstack releases. To achieve this the template will need to know which release is being deployed hence: https://github.com/juju/charm-helpers/pull/224

[James Page (james-page)]

Marking this as High as Stein is in development so this work must be done for 19.04 charm release.

[Nikolay Vinogradov (nikolay.vinogradov)]

Pull request: https://github.com/juju/charm-helpers/pull/315
Charm-glance review request: https://review.opendev.org/#/c/656956/

[Nikolay Vinogradov (nikolay.vinogradov)]

Also: https://github.com/juju/charm-helpers/pull/316 and https://github.com/juju/charm-helpers/pull/318