Comment 11 for bug 1791111

I'm working on implementing this for Horizon, and I have a working view where the user can change their password (https://review.opendev.org/672289). However, for this to be actually usable, the user has to know their user_id somehow. As far as I can tell, there is no way to determine the user_id from username without first authenticating, so the users still can't change their expired passwords.