Resolve "Generate java classes from the gRPC Proto files"

Closes #104

See merge request !198

Resolve "(CTTC) Implement SBI Driver ACTN"

Closes #90

See merge request !188

- Pre-merge cleanup

- Pre-merge cleanup

- Fixed new device drivers added IETF ACTN, gNMI OpenConfig, FlexScale
- Updated generated proto code

- Fixed dependencies of unitary test for GitLab CI/CD pipeline

- Added required Python dependencies

- Added unitary test to GitLab CI/CD pipeline

- Updated test script
- Completed unitary tests
- Improved driver's error handling
- Fixed handlers and RestApiClient
- Minor code fixings
- Rearranged data files
- Added required Python dependencies
- Corrected MockIetfActnSdnCtrl tool

- Added test script
- Improved unitary test
- Minor code fixings
- Removed unneeded files
- Added related objects factory methods

- Completed implementation of GetConfig, SetConfig and DeleteConfig methods, and related helper methods

- Progress (WIP) on IetfActnDriver class

Merge branch 'develop' of https://labs.etsi.org/rep/tfs/controller into feat/90-cttc-implement-sbi-driver-actn

Resolve "(CTTC) NBI unitary tests not running and/or not working"

Closes #94

See merge request !195

- Added test to GitLab CI/CD pipeline

- Completed test descriptor debug_api_dummy.json
- Removed unneeded debug_api_dummy.txt file
- Corrected unitary test

- Completed assertions for slices
- Added assertions for Constraint actions
- Added missing values in enums
- Added assertions for non-custom constraints
- Added field "name" in multiple objects
- Added assertions for device components
- Added assertions for link attributes
- Added assertions for connection settings
- Minor cosmetic improvements

- Corrected addition/removal of topologies, services and slices to contexts
- Minor cosmetic and linting improvements

- Updated test descriptor file
- Updated test

- Minor correction in imports

- Updated unitary tests
- Added test descriptor file

- Formatted Policy-related methods
- Minor cosmetic changes

- Added script to launch tests locally

- Minor code improvements in EthtServiceHandler, OsuTunnelHandler, and RestApiClient

- Fixed unitary tests (WIP)

- Completed implementation of EthtServiceHandler and OsuTunnelHandler
- Updated implementation of RestApiClient

- Implemented EthtServiceHandler (partial, missing get)
- Implemented OsuTunnelHandler (partial, missing get)
- Implemented common RestApiClient

- Intermediate backup
- Added example messages
- Implemented request message composers
- Implemented handlers (work in progress)

- Leftover cosmetic changes from merge request

- Updated Mock IETF ACTN SDN Controller

WebUI Service creation

Closes #109

See merge request !130

-Code cleanup

- Pre-merge clean-up