Merge pull request #10279 from edx/ned/cleaner-django-meta

common/djangoapps/config_models/models.py

common/djangoapps/course_modes/admin.py

common/djangoapps/course_modes/models.py

common/djangoapps/django_comment_common/models.py

common/djangoapps/embargo/forms.py

common/djangoapps/embargo/models.py

common/djangoapps/enrollment/serializers.py

common/djangoapps/external_auth/models.py

common/djangoapps/student/admin.py

common/djangoapps/student/models.py

common/djangoapps/third_party_auth/models.py

common/djangoapps/track/backends/django.py

common/lib/xmodule/xmodule/modulestore/tests/factories.py

common/lib/xmodule/xmodule/tests/test_xblock_wrappers.py

common/lib/xmodule/xmodule/tests/xml/factories.py

common/test/acceptance/fixtures/discussion.py

common/test/acceptance/fixtures/edxnotes.py

lms/djangoapps/bulk_email/forms.py

lms/djangoapps/bulk_email/models.py

lms/djangoapps/ccx/models.py