email change

no-jira: fix the error in perf500 test in PropertyTest, remove reference to log4j logger in tests, remove duplicate closeSession in @after

OO-538: unify our implementation to retrieve entity managers with spring, remove wrapper classes to acesss directly transaction and entity manager, don't cache them anymore in our code, @Transactional fully functional, add some sleep in unit tests to wait from the new asynchronous multi user events

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branch : bps