Fix wildfly-core build order

this way generated-configs contain full configuration that ParseAndMarshalModelsTestCase.java uses.
and also some small cleanup of ParseAndMarshalModelsTestCase test
Undertow upgrade
Merge pull request #5643 from ctomc/testsuite-problems

Fix wildfly-core build order
Prepare for 8.0.0.CR1
Fix broken assemblies
Next is 8.0.0.Final