[GSS](CD 17) Migration documentation needs to mention support limitations related to use of alternative Hibernate releases

The migration documentation should mention that use of Hibernate 3 or Hibernate 4 (i.e. any version of Hibernate other than the one packaged with EAP 7) creates an unsupported configuration for which there is no tested configuration (Red Hat does not maintain documentation for the use of alternative Hibernate release versions and the exact configuration required may vary widely with usage and the specific version chosen). Only the bundled Hibernate release is tested with any EAP release.