cleanup: pep8

build_files/buildbot/master.cfg

build_files/buildbot/master_unpack.py

build_files/buildbot/slave_compile.py

build_files/buildbot/slave_pack.py

doc/python_api/examples/bpy.types.Panel.2.py

doc/python_api/sphinx_changelog_gen.py

intern/cycles/blender/addon/engine.py

intern/cycles/blender/addon/properties.py

intern/cycles/blender/addon/ui.py

release/scripts/modules/bl_i18n_utils/bl_extract_messages.py

release/scripts/modules/bl_i18n_utils/settings.py

release/scripts/modules/bl_i18n_utils/utils_spell_check.py

release/scripts/modules/bpy_extras/keyconfig_utils.py

release/scripts/modules/bpy_restrict_state.py

release/scripts/modules/bpyml_ui.py

release/scripts/modules/nodeitems_utils.py

release/scripts/modules/rna_prop_ui.py

release/scripts/modules/rna_xml.py

release/scripts/modules/sys_info.py

release/scripts/startup/bl_operators/node.py