Django 1.11.6 breaks OpenStack Horizon when upgrading from 1.10.6

[Byron Yi]

Django 1.11.6 is packaged with latest Debian sid (2017-10-12) and 1.10.6 is packaged with latest Debian stable.

Detailed error log is here:

Setting up python-django-openstack-auth (2.4.1-2) ...

Setting up python-django-pyscss (2.0.2-6) ...

Setting up python-django-horizon (3:10.0.1-1) ...

Setting up openstack-dashboard (3:10.0.1-1) ...

Traceback (most recent call last):

  File "/usr/share/openstack-dashboard/manage.py", line 25, in <module>

    execute_from_command_line(sys.argv)

  File "/usr/lib/python2.7/dist-packages/django/core/management/__init__.py", line 364, in execute_from_command_line

    utility.execute()

  File "/usr/lib/python2.7/dist-packages/django/core/management/__init__.py", line 338, in execute

    django.setup()

  File "/usr/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup

    apps.populate(settings.INSTALLED_APPS)

  File "/usr/lib/python2.7/dist-packages/django/apps/registry.py", line 108, in populate

    app_config.import_models()

  File "/usr/lib/python2.7/dist-packages/django/apps/config.py", line 202, in import_models

    self.models_module = import_module(models_module_name)

  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module

    __import__(name)

  File "/usr/lib/python2.7/dist-packages/openstack_auth/models.py", line 15, in <module>

    from openstack_auth.user import User        # noqa

  File "/usr/lib/python2.7/dist-packages/openstack_auth/user.py", line 26, in <module>

    from openstack_auth import utils

  File "/usr/lib/python2.7/dist-packages/openstack_auth/utils.py", line 20, in <module>

    from django.contrib.auth import middleware

  File "/usr/lib/python2.7/dist-packages/django/contrib/auth/middleware.py", line 4, in <module>

    from django.contrib.auth.backends import RemoteUserBackend

  File "/usr/lib/python2.7/dist-packages/django/contrib/auth/backends.py", line 6, in <module>

    UserModel = get_user_model()

  File "/usr/lib/python2.7/dist-packages/django/contrib/auth/__init__.py", line 198, in get_user_model

    "AUTH_USER_MODEL refers to model '%s' that has not been installed" % settings.AUTH_USER_MODEL

django.core.exceptions.ImproperlyConfigured: AUTH_USER_MODEL refers to model 'openstack_auth.User' that has not been installed

dpkg: error processing package openstack-dashboard (--configure):

 subprocess installed post-installation script returned error exit status 1

dpkg: dependency problems prevent configuration of openstack-dashboard-apache:

 openstack-dashboard-apache depends on openstack-dashboard; however:

  Package openstack-dashboard is not configured yet.

dpkg: error processing package openstack-dashboard-apache (--configure):

 dependency problems - leaving unconfigured

Errors were encountered while processing:

 openstack-dashboard

 openstack-dashboard-apache

E: Sub-process /usr/bin/dpkg returned an error code (1)

A downstream bug is filed here: https://bugs.launchpad.net/horizon/+bug/1723109