Add support for django_openstack_auth

It would be useful for development, reviewing and testing to add
support for django_openstack_auth to devstack.

This change adds the integration tests to the openstack_auth
list of test: https://review.openstack.org/#/c/86528/

Change-Id: Ifbd336b83f6b2beb23996b599ec820232c13efdd
Closes-Bug: #1262121
diff --git a/stack.sh b/stack.sh
index bd99b5b..2fe01d0 100755
--- a/stack.sh
+++ b/stack.sh
@@ -757,6 +757,8 @@
 fi
 
 if is_service_enabled horizon; then
+    # django openstack_auth
+    install_django_openstack_auth
     # dashboard
     install_horizon
     configure_horizon