Backport fix for HHH-1657 hql update generate wrong sql with joined subclass hierarchy to EAP5

Hibernate returned an exception stating that the primary key of a child entity was ambiguous when updating the primary key of the child element while both entities, the entity of the parent element and the entity of the child element, were mapped with joined subclass method. This happened because Hibernate generated an incorrect SQL leaving out the table alias from the id column. An upstream fix that fixes this issue has been backported to Hibernate and Hibernate now generates the correct SQL under these circumstances.