Updated openstack/openstack
Project: openstack/django_openstack_auth  47fcf7ae4ad68b175914ab9611a59d359aa754c0

Adding back the forms.Login import

Changing this breaks all older versions of Horizon. Adding it back
in to allow older versions to continue working.

Closes-Bug: #1332855
Change-Id: Icdb206d4095b1746eef9be02ca63f2aa9cfe1081