Updated openstack/openstack
Project: openstack/django_openstack_auth  76a7420f7ff7635f9d188d2ef9ab783c58cc04a5

Set default auth_url from django settings when auth_url is None

This is useful when users(client web forms) just provide
username/password to authenticate with django_openstack_auth. In this
case, they can still login if keystone version == 2.0 since keystone
v2.0 only requires username/password and auth_url to authenticate. In
most cases, auth_url can get from django(horizon)'s settings.

Fix-bug: #1316490
Change-Id: I2ed24238adb79b6ef33e4bf20232b6a924ad0b1f