Incidental pep8 changes

cms/djangoapps/auth/authz.py

cms/djangoapps/contentstore/features/common.py

cms/djangoapps/contentstore/features/section.py

...ps/contentstore/features/studio-overview-togglesection.py

cms/djangoapps/contentstore/features/video.py

cms/djangoapps/contentstore/module_info_model.py

cms/djangoapps/contentstore/tests/test_checklists.py

cms/djangoapps/contentstore/tests/test_contentstore.py

cms/djangoapps/contentstore/utils.py

cms/djangoapps/contentstore/views/course.py

cms/djangoapps/contentstore/views/item.py

cms/djangoapps/models/settings/course_details.py

common/djangoapps/terrain/course_helpers.py

common/djangoapps/xmodule_modifiers.py

common/lib/xmodule/xmodule/combined_open_ended_module.py

common/lib/xmodule/xmodule/fields.py

common/lib/xmodule/xmodule/gst_module.py

common/lib/xmodule/xmodule/html_module.py

common/lib/xmodule/xmodule/modulestore/__init__.py

common/lib/xmodule/xmodule/modulestore/draft.py