Convert Postman integration tests to Groovy script using cURL commands

[Mat-san]

To be able to integrate the integration test into the Gradle framework and be platform independent, we need to convert them into cURL command (possible with postman) and create checks using Groovy.

[ding-ma]

Don't need, we just need a way to test the end points. We will be using Newman as specified in the wiki. It allows for automatic testing which makes our life easier