Comment 16 for bug 1541621

Reviewed: https://review.openstack.org/327386
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=6b84b243a1c92ecfc8c525631747c0f6eaa30f2d
Submitter: Jenkins
Branch: stable/mitaka

commit 6b84b243a1c92ecfc8c525631747c0f6eaa30f2d
Author: Roxana Gherle <email address hidden>
Date: Fri May 27 10:00:39 2016 -0700

    Return 404 instead of 401 for tokens w/o roles

    If a scoped-token was validated and the user didn't have any role assignment
    on a project, keystone would return a 401 Unauthorized. This was the
    case when the fernet token provider was enabled because the reference is
    rebuilt on every request. The uuid token provider has a different behavior - if
    the token isn't found in the backend a 404 Not Found is returned. Furthermore,
    for persisted tokens, any validation error will result in 404, such as in the
    case where user no longer have any roles assigned for the given scope.

    These two behaviors should be consistent regardless of the token provider.

    This problem was not fixed entirely with https://review.openstack.org/#/c/277436/
    because of token caching in devstack which masks the wrong error code for the
    period of time the token is cached. Therefore, in order to test this in devstack
    you need to take into account the caching time after un-assigning the role on
    a project and while using the same fernet token.

    Closes-Bug: #1541621
    Change-Id: I9d36c5c73d5a832cd04dd4c1368b8d769e0acc4c
    (cherry picked from commit fde57f68e290575e874234fc751d2380637a07f5)