code clean up

src/device/service/drivers/openconfig/templates/Inventory.py

src/nbi/service/__main__.py

...service/rest_server/nbi_plugins/ietf_hardware/Hardware.py

...ice/rest_server/nbi_plugins/ietf_hardware/Untitled-5.json

...vice/rest_server/nbi_plugins/ietf_hardware/YangHandler.py

...service/rest_server/nbi_plugins/ietf_hardware/__init__.py

src/nbi/service/rest_server/nbi_plugins/tfs_api/Resources.py

src/nbi/service/rest_server/nbi_plugins/tfs_api/__init__.py