Merge branch 'master' into usamasadiq/bom-2327-pylint-amnesty

cms/djangoapps/api/__init__.py

cms/djangoapps/api/v1/serializers/course_runs.py

...ngoapps/api/v1/tests/test_serializers/test_course_runs.py

cms/djangoapps/api/v1/tests/test_views/test_course_runs.py

cms/djangoapps/api/v1/tests/utils.py

cms/djangoapps/api/v1/views/course_runs.py

cms/djangoapps/cms_user_tasks/tests.py

cms/djangoapps/contentstore/api/views/course_import.py

cms/djangoapps/contentstore/api/views/course_quality.py

cms/djangoapps/contentstore/api/views/course_validation.py

cms/djangoapps/contentstore/course_group_config.py

cms/djangoapps/contentstore/courseware_index.py

cms/djangoapps/contentstore/debug_file_uploader.py

cms/djangoapps/contentstore/git_export_utils.py

...goapps/contentstore/management/commands/cleanup_assets.py

...ngoapps/contentstore/management/commands/create_course.py

...ngoapps/contentstore/management/commands/delete_course.py

...goapps/contentstore/management/commands/delete_orphans.py

...apps/contentstore/management/commands/edit_course_tabs.py

cms/djangoapps/contentstore/management/commands/export.py