Integration with tng-sdk-project

[stefanbschneider]

Overall goal: Online SDK editor running the different SDK tools, integrated via one web interface.

First step: Auto. create a folder structure and project.yml, when generating descriptors. Put the generated descriptors in there and download the whole folder, which is then ready for validation/packaging.

[stefanbschneider]

After discussion with Manuel: Let's turn this around and implement descriptorgen in Python with CLI and REST API as part of tng-sdk-project. See sonata-nfv/tng-sdk-project#19

[stefanbschneider]

This would also solve #5

[stefanbschneider]

The descriptorgen now auotmatically generates the project.yml. Full integration will be done in the tng-project repo. CLI is already implemented. Integration with tng-project and REST API will come after release v1.