New generic client and service interfaces, new settings framework, new unit test scheme

See merge request teraflow-h2020/controller!104

- added missing dependency for unitary tests

- Corrected unitary test to execute pipeline

- corrected unitary test file for device component
- arranged clients used by optical centralized attack detector
- Minor corrections in unitary test of Context component
- corrected skeleton for unitary tests of Slice component

- Migrated to use new generic gRPC servicer and clients
- Migrated to use new settings framework
- Improved definition of unitary tests and solved some bugs
- Minor code formatting/styling

- added helper methods to object_factory

- Migrated to use new generic gRPC servicer and clients
- Migrated to use new settings framework
- Commented wrong/outdated unitary tests (to be coded)
- Minor code formatting/styling

- Migrated to use new generic Rest servicer
- Moved client declarations close to use places to prevent initialization locks
- Adaptations to comply with the new settings framework
- Updated unitary tests to use new generic Rest and gRPC servicers and clients
- Minor code styling/formatting

- Migrated to use new generic gRPC servicer
- Migrated to use new generic Rest servicer
- Migrated to use new settings framework
- Minor code formatting/styling

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

- Migrated to use new generic gRPC servicer
- Migrated to use new generic Rest servicer
- Migrated to use new settings framework
- Migrated tests to use new generic servicers and mock's
- Extracted common unitary test functionalities into separate code files
- Minor code styling/formatting

- Migrated to use new generic gRPC servicer
- Migrated to use new generic Rest servicer
- Migrated to use new settings framework
- Migrated tests to use new generic servicers and mock's
- Solved bug with endpoint monitors' population (dupplicated sample types due to wrong key generation)
- Use Emulated driver when both driver and device type are not specified
- Separated unitary tests and execution scripts per device driver
- Extracted common unitary test functionalities into separate code files
- Minor code styling/formatting

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

- defined unified constants for all micro-services
- defined common settings getter methods
- defined generic gRPC servicer
- defined generic Rest servicer
- defined common MockServicer for Monitoring component
- removed old common/tests MockService class; to be replaced by new generic gRPC servicer
- minor code formatting/styling

- relocated/renamed wrongly placed/named scripts
- removed unneeded scripts
- added missing headers in scripts

Feat/fix cobertura

See merge request teraflow-h2020/controller!103

First version of DeviceDriver for MicroWave devices

See merge request teraflow-h2020/controller!101

- code styling and cleanup

Device component: Added support for ACLs and Candidate datastore in OpenConfigDriver

See merge request teraflow-h2020/controller!102

- Corrected default values in unitary test config template
- Minor code styling

- solved minor bug with default openconfig operations.

- OpenConfigDriver: code cleanup and added default values

- Updated default OpenConfig unitary test template config
- Added minor code improvements in OpenConfig Driver

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