Add integration test of Seam2 integration

https://github.com/jbossas/jboss-as/commit/b036d103ed503b0099d3f62c1c50f954aef03137 will break the Seam 2 integration since Seam2Processor will look for the specific jar name. Yet the commit did not result in any testsuite failure. So, it seems we have no integration testing.