Final arrangements in Device monitoring

See merge request teraflow-h2020/controller!49

# Conflicts:
#   src/device/service/DeviceServiceServicerImpl.py
#   src/device/service/database/EndPointModel.py
#   src/device/service/database/KpiSampleType.py
#   src/device/service/drivers/emulated/EmulatedDriver.py
#   src/device/service/drivers/openconfig/templates/EndPoints.py
#   src/device/tests/Device_Emulated.py

- support definition of KPISampleTypes per EndPoint in Context and Device
- improvements in definition of objects used for test cases
- adapted few values in unit tests
- updated gRPC-generated Python code for OpticalCentralizedAttackDetector

First functional version of Device monitoring

See merge request teraflow-h2020/controller!48

Commit for the first code freeze

See merge request teraflow-h2020/controller!46

Add first draft for TE service

See merge request teraflow-h2020/controller!47

Multiple adjustments in CI/CD pipeline and related issues.

See merge request teraflow-h2020/controller!45

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

DLT component

See merge request teraflow-h2020/controller!43

Including the creation of secrets in the K8s deployment script, and including the correct namespace

See merge request teraflow-h2020/controller!41