ISPN-4590 Update Hibernate ORM to 4.3.6.Final

Hibernate ORM now requires in OSGi javax.persistence 2.1.0 at least.

https://issues.jboss.org/browse/ISPN-4590

This change updates the JPA persistence feature file to match the requirements of ORM 4.3.6.Final. It currently installs in the OSGi container javax.persistence version 2.1 (ORM dep) and 2.0 (ISPN dep). Not sure if it's a good idea to update the ISPN dep to 2.1 and drop 2.0 from the feature file. What do you think?
It was required for 2.0 but no longer required fro 2.1. I will remove it.