Comment 158 for bug 1776504

Reviewed: https://review.openstack.org/609839
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=184c84ae76b1e4dc6b9907caf0cfa0d65bf8ecc5
Submitter: Zuul
Branch: master

commit 184c84ae76b1e4dc6b9907caf0cfa0d65bf8ecc5
Author: Morgan Fainberg <email address hidden>
Date: Thu Oct 11 15:16:02 2018 -0700

    Remove pre-flask legacy code

    This removes common.controller, common.extension, common.router, and
    common.wsgi. Relevant code from common.wsgi (used by AuthContext) was
    moved into keystone.server.flask.request_processing.middleware.auth_context.

    keystone.api.discovery now uses keystone.flask.base_url

    test_middleware and test_exception were modified to reflect the changes
    to the remaining code from keystone.common.wsgi

    keystone.common.authorization only holds a couple constants for auth
    work now.

    Routes is removed from requirements.txt

    Release-Note for migration to flask added.

    Change-Id: I81563b6a49c8f12ecade058a9483f3b6f070dc72
    Closes-Bug: #1776504