Tighten up the dependency tree of subsystem-test

In general I'd like to tighten (aka eliminate) up the use of transitive dependencies when various WildFly and WildFly Core maven modules depend on each other. Things should be explicit so unwanted coupling cannot creep in.

The subsystem-test module is important in this regard as pretty much all extension modules depend on it's pom. So I want it and its children and its direct dependencies to only depend on other wf core modules directly, no transitive deps allowed.