Comment 8 for bug 1656076

Reviewed: https://review.openstack.org/419693
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=0f3f08c3df0dd6c32e685dae6726e945b01ea8c7
Submitter: Jenkins
Branch: master

commit 0f3f08c3df0dd6c32e685dae6726e945b01ea8c7
Author: Morgan Fainberg <email address hidden>
Date: Thu Jan 12 15:19:48 2017 -0800

    Force use of AuthContext object in .authentcate()

    Force the keystone.auth.controllers.Auth.authenticate method to
    require the use of an AuthContext object instead of something
    duck-typed (dictionary). This is done to ensure the security and
    integrity of IDENTITY_KEYS are covered and values are not changed
    by a plugin due to the security built into AuthContext being
    circumvented since it was not used. This is not pythonic, this
    is being done for hardening purposes.

    Change-Id: I013846af59587d17b15ca4cf546e6372231f576e
    Closes-Bug: #1656076