Pre-merge code cleanup

src/context/service/ContextServiceServicerImpl.py

src/context/service/database/OpticalConfig.py

src/context/service/database/OpticalLink.py

src/device/service/DeviceServiceServicerImpl.py

...task_scheduler/tasks/Task_OpticalConnectionDeconfigure.py

...e/task_scheduler/tasks/Task_OpticalServiceConfigDelete.py

...service/task_scheduler/tasks/Task_OpticalServiceDelete.py

...ervice/service/task_scheduler/tasks/Task_ServiceDelete.py

src/service/service/tools/ObjectKeys.py