Reverting changes that broke JPA server tests:
  - 59f81adda9a7809ecbc535dd2a2d0dcb2010ae47
    Hot fix: JAXBContext contained merge-conflict and was breaking build.
  - 7d3ec99870aba40f8501ca533807776db1e17f5c
    Hot fix: diamond (Java 1.7) made build fail.
  - 00cadb0f2ff112ab8181b7d3e8394c9ec1d76e95
    Bug #447339 - Skip Bean Validation on objects that are not constrained.
    Bug #328372 - validator used by default
    Bug #391566 - perf: validator listener should not be set on entities with no constraints
  - 7478553be19646275ebf08f87a07d1a9f9ed10ed
    Bug #447345 - Performance tests - add support for running bean validation and jpa tests.