Merge pull request #20303 from edx/dcs/masters-access

common/djangoapps/course_modes/admin.py

common/djangoapps/course_modes/api/serializers.py

common/djangoapps/course_modes/api/urls.py

common/djangoapps/course_modes/api/v1/urls.py

common/djangoapps/course_modes/api/v1/views.py

common/djangoapps/course_modes/apps.py

common/djangoapps/course_modes/helpers.py

common/djangoapps/course_modes/models.py

common/djangoapps/course_modes/signals.py

common/djangoapps/course_modes/tests/factories.py

common/djangoapps/course_modes/tests/test_admin.py

common/djangoapps/course_modes/tests/test_models.py

common/djangoapps/course_modes/tests/test_signals.py

common/djangoapps/course_modes/tests/test_views.py

common/djangoapps/course_modes/urls.py

common/djangoapps/course_modes/views.py