Kie server: using cargo + failsafe to execute integration tests

The tests are now completely independent of the container setup, which makes them very easy to execute with other/custom containers. 

I am planning to add more integration tests in near future.
The url property uses "eap63", this uses id "jboss74x". Let's pick one of the 2 terms (even if they are aliases).

And in fact, they aren't pure aliases. Their license differs.