
Lower constraints do not cap all dependencies, causing incompatibilities. Update Jinja2 to 2.11.3 (the last pre-3.0 version) and downgrade MarkupSafe, Werkzeug and itsdangerous for Flask. Something must have changed in one of the dependencies, and the Location header is no longer returning the host in the URL. Remove subunit and testscenarios, we don't use them directly. Change-Id: I5bad754ef7b1bec6986c2b4293a38226c5a261af