title: relation "django_content_type" does not exist during CI tests
body: <p>I am hitting <code>psycopg2.ProgrammingError: relation &quot;django_content_type&quot; does not exist</code> error during CI builds:</p>
  <ul>
  <li><p><a href="https://travis-ci.org/VeggieSailor/vegbasket/jobs/91277871" rel="nofollow noreferrer">https://travis-ci.org/VeggieSailor/vegbasket/jobs/91277871</a></p>
  </li>
  <li><p><a href="https://drone.io/github.com/VeggieSailor/vegbasket/119" rel="nofollow noreferrer">https://drone.io/github.com/VeggieSailor/vegbasket/119</a></p>
  <p>however I have migrations in place, I think:</p>
  </li>
  <li><p><a href="https://github.com/VeggieSailor/vegbasket/tree/nomigrations/vegbasketapp/vegbasketapp/vsdata/migrations" rel="nofollow noreferrer">https://github.com/VeggieSailor/vegbasket/tree/nomigrations/vegbasketapp/vegbasketapp/vsdata/migrations</a></p>
  </li>
  </ul>
  <p>and <code>./manage.py test</code> locally works. Algo logs shows that migrations from contenttypes have been applied, I am clueless.</p>
  <p>I am using django 1.8.7 dev from github because I read <a href="https://docs.djangoproject.com/en/1.8/releases/1.8.7/" rel="nofollow noreferrer">https://docs.djangoproject.com/en/1.8/releases/1.8.7/</a> that in 1.8.7 there are fixed some migrations related bugs. However, same bug appear with 1.8.6.</p>