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

- Arranged commit before merge
- Replaced string-based timestamps by context.Timestamp
- Created helper functions to convert timestamps string from/to float
- Arranged requirements to meet dependencies of converter functions

Modifications in the monitoring information model and skeleton of the methods in the server and client

- Implemented MonitorDeviceKPI RPC method
- Implemented Endpoint pre-configruation for Emulated Driver
- Implemented MockMonitoringService for testing Device monitoring capabilities
- Implemented Monitoring Loops to collect samples from drivers and forward them to Monitoring Service
- Test unit for Emulated Device Monitoring half implemented.
- Minor bug resolutions in OpenConfig Driver

Deactivated some Device monitoring functionality partially implemented to enable a functional commit into develop.