Test: JWT integration test.
Test: JWT integration test.

This commit add JWT claim integration tests, the test added are:

- Policy using plain type to validate that data is retrieved correctly.
- Policy using liquid match type to validate that works.
- Policy with multiple rules, whitelist and blacklist rules.
- Policy with custom error message

Signed-off-by: Eloy Coto <2a8acc28452926ceac4d9db555411743254cf5f9@gmail.com>

3scale/docker-gateway,3scale/docker-gateway,3scale/apicast,3scale/apicast,3scale/apicast,3scale/apicast