Temporary change the django_openstack_auth requirement

The new django_openstack_auth version causes gate job issues like:
http://logs.openstack.org/33618/5/gate/gate-tempest-devstack-vm-full/29950/console.html

Temporary disabling the 1.1.0 version.

Change-Id: Ibcb5656f0d829e17a759274ef2586d3a3474cd0b