- Added missing POST/PUT/DELETE methods for context, topology, device, link, service, and slice

- Added YANG Validation with LibYang
- Corrected POST logic to support multiple ACL Entries and interfaces
- Corrected unitary tests

- Cosmetic updates

- Added missing imports
- Fixed pull-from-develop leftovers

- Updated License headers

- Minor fixes in IETF ACL Test client

- Added missing import

- Moved IETF ACL Test client to tests folder
- Corrected target ACL interface in test script

- Improved test client
- Added debug log messages
- Code cleanup
- Added dump of configured resources and rules while NBI starts

- Enabled DEBUG mode
- Corrected REST-API server binding paths
- Added missing imports
- Minor cosmetic improvements

1) Yang handler file
2) Hardware inventory file
3) Minor changes

- Updated README.md file
- Fixed libyang version in Dockerfile
- Fixed libyang version in install_requirements.sh
- Added folder libyang to global gitignore
- Added generation of .gitignore file for libyang/build