Parse responses in tests with jackson

[rybalkinsd]

Currently most of tests are using only response code to validate results.
The idea is to read postman-echo documentation and check what exactly do we expect in response body. Most of responses are json with

• cookies
• headers
• etc

need to check all the expectations

[gokulchandra]

@rybalkinsd Have you already started working on this? If not, I can pick this up.

[rybalkinsd]

@gokulchandra not in progress. Welcome to pick this task. Any questions about details are very welcome

[gokulchandra]

@rybalkinsd Cool. I will keep you posted on its progress. 👍

[gokulchandra]

Resolved in #60