Federated auth plugins do not work with unversioned auth_url

[Pavlo Shchelokovskyy]

When using federated auth identity plugins (anything based on FederationBaseAuth basically) providing the auth_url in unversioned form (w/o /v3 at the end) breaks auth as it attempts to post to <keystone-url-w/o-v3>/OS_FEDERATION which is incorrect and results in 404 NotFound from Keystone.

On the other hand, other v3-specific identity plugins like V3Password work fine with such auth_url, adding v3 if needed.

[Pavlo Shchelokovskyy (pshchelo)]

fix proposed at https://review.opendev.org/c/openstack/keystoneauth/+/866189

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/keystoneauth/+/866189
Committed: https://opendev.org/openstack/keystoneauth/commit/737790f7329a83822b442498cb5b618f9c9f4edd
Submitter: "Zuul (22348)"
Branch: master

commit 737790f7329a83822b442498cb5b618f9c9f4edd
Author: Pavlo Shchelokovskyy <email address hidden>
Date: Wed Nov 30 18:56:55 2022 +0200

    Allow federation to work with unversioned auth_url

    while e.g. V3Password works perfectly fine with unversioned auth_url
    like 'http://keystone', everything based on FederationBaseAuth
    does not and only requires versioned v3 auth_url.

    Since OS_FEDERATION is implemented only in v3, this patch
    makes sure that federated_token_url has v3 in it, thus allowing
    for unversoned auth_url as well.

    Closes-Bug: #1998366
    Change-Id: I1f0b00b6f721c53bb5308e03223d0c1564ca81b3

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/keystoneauth 5.2.0 release.