Merge pull request #5112 from edx/sarina/quality-clean

common/djangoapps/student/models.py

common/djangoapps/student/views.py

common/lib/capa/capa/tests/test_html_render.py

common/lib/i18n/tests/test_extract_and_generate.py

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

...n/lib/xmodule/xmodule/modulestore/tests/sample_courses.py

...odule/xmodule/modulestore/tests/test_split_modulestore.py

common/lib/xmodule/xmodule/peer_grading_module.py

common/lib/xmodule/xmodule/tests/test_lti_unit.py

lms/djangoapps/dashboard/views.py

lms/djangoapps/django_comment_client/forum/tests.py

lms/djangoapps/foldit/tests.py

lms/djangoapps/instructor/views/legacy.py

lms/djangoapps/shoppingcart/models.py

lms/lib/comment_client/comment_client.py

lms/lib/comment_client/commentable.py