Improve infrastructure for experiments

[AML14]

This includes the following:

• RESTest jar.
• All the necessary directory structure (e.g., folders with generated data by ARTE, Allure, etc.).
• Shell script to run all RESTest instances from benchmark.
• All resources for every API.

For every API under test, the following resources should be included:

• One Swagger.
• Multiple testConfs.
• Multiple properties files.

Create all resources only in Betty. In RESTest, create only the folder containing all resources for each API. Test each API configuration as they are ready.