[WFLY-3656] Use chained transformers for messaging subsystem

This PR only contains the refactoring of the messaging subsystem transformers.
I renamed and reordered the tests in a sane way but there is no changes in the versions that are tested (from AS7 7.1.2 up to WildFly 8.0.0) for the latest messaging version (3.0).
I removed the transformers test from previous messaging version (2.0).

EAP 6.2 will be addressed in a later commit as it likely need a new test-controller version.

JIRA: https://issues.jboss.org/browse/WFLY-3656
thanks for the tip, I've used this method instead of doing the loop.