- OpenConfigDriver migrate from netconf_client to ncclient library
- Clean integration of Candidate datastore
- OpenConfigDriver code cleanup

- Implemented support for ACLs
- Added suport for Candidate datastore

Signed-off-by: Georgios Katsikas <katsikas.gp@gmail.com>

Scripts:
- added missing commands to script run_tests_locally.sh

Device:
- added key formatting inside unsibscribe from monitoring
- added termination attribute in GetState to properly interrupt monitoring loops

Service:
- arranged service component testing, missing fixtures

Monitoring:
- added missing environment variable INFLUX_PORT

First functional version of Service with Service Handler for L3NM-Emulated services using Emulated Devices

Updated gRPC proto files to prevent trouble with KPI sample types in devices, also updated files related to this issue.

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

Device:
- Implemented Driver API with some special resources to enable retrieving endpoints from devices, interfaces, and network instances.
- Implemented special resource_keys (_connect/*) to enable AddDevice to obtain settings used to connect to remote devices (address, port, username, password, etc.)
- Implemented Emulated Driver (only for testing)
- Implemented OpenConfig Driver (missing to implement monitoring; templates for Infinera devices to be tested with other device vendors)
- Minor bugs and code improvements
- Improved test unit to enable easy testing of vendor devices and keep credentials secret.

- reorganized some files and modules
- implemented discovery of device endpoints for OpenConfig driver
- implemented retrieval of current configuration for OpenConfig driver
- updated test units and separated in emulated and openconfig test sets