HSEARCH-1386

https://hibernate.atlassian.net/browse/HSEARCH-1386

Doesn't resolve all compatibility problems with ORM 4.3 but specifically addressed HSEARCH-1386: not depending on the moved JtaPlatform Service.

We also implement the new required method in the EventListener interface so that it can work with ORM 4.3 as long as the new methods on Session / EntityManager are not invoked (as they are not implemented yet).