Comment 4 for bug 1433331

I think this can be closed now since a bunch of fixes landed to make fernet the default [0]. The TestFernetTokenProvider class has been refactored in master and no longer exists. It has been replaced with Fernet test classes that inherit tests from general test classes.

[0] https://review.openstack.org/#/q/status:merged+project:openstack/keystone+branch:master+topic:make-fernet-default