- Changed default values to False for config flags ALLOW_EXPLICIT_ADD_DEVICE_TO_TOPOLOGY and ALLOW_EXPLICIT_ADD_LINK_TO_TOPOLOGY

- Added config flag ALLOW_EXPLICIT_ADD_DEVICE_TO_TOPOLOGY
- Added config flag ALLOW_EXPLICIT_ADD_LINK_TO_TOPOLOGY
- Added logic to explicitly add devices and links to topologies

- Added/Updated headers
- Added script to update copyright headers

- reviewing integration with CockroachDB
- reviewing context REST API
- reviewing database schema
- reviewing code

- Migrated to use new generic gRPC servicer
- Migrated to use new generic Rest servicer
- Migrated to use new settings framework

- monitoring/test_monitoring.py: provides a basic testing skeleton
- monitoring/requirements.in/.txt: updated with pytest
- monitoring/genproto.py: added instructions to import generated Python modules using "from . import ..." instead of "import ..."; otherwise, pytest and other possible modules doing imports might complain.
- monitoring/monitoring_server.py: packed start_server and stop_server functionaity to simplify test definition, minor formattings, bug resolutions and improvements in package import.
- monitoring/monitoring_client.py: minor formattings, bug resolutions, and improvements in package import.