WS-413: cleanup and pydoc addition

...i/utilities/system_mediator/system_mediator/arbitrator.py

apps/cli/utilities/system_mediator/test/test_arbitrator.py

apps/cli/utilities/wf_monitor/test/test_wf_monitor.py

apps/cli/utilities/wf_monitor/wf_monitor/monitor.py

shared/messaging/test/test_router.py

shared/workspaces/test/test_execution_manager.py

shared/workspaces/test/test_workflow_service.py

...paces/workspaces/capability/services/execution_manager.py

...rkspaces/workspaces/workflow/services/workflow_service.py