Add a backport of Django 1.8's URLValidator.
Review Request #8978 — Created May 30, 2017 and submitted — Latest diff uploaded
The URLValidator that ships with Django 1.6 is pretty basic, and doesn't
understand URLs that include credentials. This change adds a backport of the
Django 1.8 version, which does that plus more.
Used this in conjunction with a change in Review Board.