Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/device-adapt-to-context-api

Merge branch 'develop' of https://gitlab.com/teraflow-h2020/controller into feat/device-adapt-to-context-api

Extend installation documentation and provide deployment script

See merge request teraflow-h2020/controller!26

Context service and Database API rework

See merge request teraflow-h2020/controller!25

- Adapt component and unitary tests to support configuration environment variables

- Final version of Context service ready for integration tests
- Integrated REST API read-only methods
- Updated test units for gRPC and REST API interfaces
- Improved flag for pre-populating database with fake testing data
- Combined Redis within Context POD

Common:
- Renamed common.metrics to common.rpc_method_wrapper
- Moved ServiceException to common.rpc_method_wrapper
- Implemented High-Level ORM methods to simplify Database handling

Context:
- Added flag to auto-populate fake data for testing purposes
- Added fake objects for testing purposes
- Minor corrections in ORM Database Models
- Reimplemented gRPC Servicer methods using HighLevel ORM helper methods
- Implemented complete unit testing of gRPC Servicer
- Added Message Broker to enable distribution of database events
- Implemented gRPC GetEvents methods
- Modified default config values to support larger number of persistent connections for events streaming
- Reimplemented Context REST Resource to re-use gRPC Servicer and prevent duplicating code

Automated Tests:
- Reactivated common and context unit tests

Common:
- Implemented Message Brokering framework supporting multiple backends
- Implemented InMemory Message Brokering Backend for testing purposes
- Implemented Redis Backend
- Implemented Message Brokering unit tests
- Minor improvements in ORM Framework
- Added Message Broker framework unit testing into automated local tests

Context:
- ORM models completed and tested
- Deactivated unneeded code-linting warnings
- Improved coding of fast_hasher method
- Added test unit for fast_hasher method
- Improved organization and structure of test units

Context:
- Moved old code to separate folder (will be removed in future commit when development is completed)
- Solved bug with Link-EndPoint retrieval
- Implemented ServiceModel and related unit tests
- Moved helper methods to Tools.py file in database

Common:
- added ORM helper function get_related_instances
- minor modifications in ORM framework

Proto:
- field/message/enum renamings in context.proto to normalize notation

Context:
- Expanded service/database/Models.py into separate models to facilitate coding
- Completed implementation of Get/Set/List/Remove methods for Context, Topology, Device, Link, and EndPoint; also completed for relation models between topology and device/link, and ConfigModels
- Implemented test units for Get/Set/List/Remove methods for Context, Topology, Device, Link, and EndPoint
- Implemented skeleton for Get/Set/List/Remove methods for Service.
- Added Tools.py with helper methods to fimplify handling of enums between ORM and gRPC messages.

Common:
- Added missing test units for ORM framework
- Solved few bugs in ORM framework
- Implemented initial skeleton of MessageBroker to implement GetEvents methods for Context.

Context:
- Implemented TopologyModel and related test units
- Solved few bugs in ContextModel

Proto:
- Minor corrections in context.proto

Common:
- Minor corrections in common.orm.backend
- Improved definition of orm.Model class with get_instances and get_references
- Extended ORM unitary tests with get_instances and get_references

Context:
- Implemented missing methods in ContextClient
- Started to implement new Context data models using ORM.
- ContextModel functional using ORM and gRPC.
- Arranged old code file placing

- Added servicer RPC methods using new metrics framework.

- Added methods to automate metric class generation
- Added decorator for servicer RPC methods to add metering and logging features automatically
- Added unit tests
- Minor imptovements in context unit testing

- Extended database API with novel ORM
- Carrying out tests over ORM and InMemoryDB
- Foreign Keys need more testing

- Context Database API and ORM rework in progress

Renaming the previous `centralized cybersecurity` into `centralized attack detector`

See merge request teraflow-h2020/controller!23

- Complete rework of Database API
- Integration of Database API into Context
- Improvement of API

This commit is not a final implementation, just an intermediate backup.

Skeleton implementation of the centralized cybersecurity component

See merge request teraflow-h2020/controller!19

Fixing two issues with the previous commit: i) obtaining the correct service gRPC port; ii) updating the gitlab ci file to use the correct service port.

Modifying the test and coverage execution files to accommodate the case where...

See merge request teraflow-h2020/controller!21

Integrate implementation of Device Driver API and minor common improvements

See merge request teraflow-h2020/controller!22