[eclipselink-dev] Fix for 370429 checked in

[Christopher Delahunt <christopher.delahunt@xxxxxxxxxx>]

https://bugs.eclipse.org/bugs/show_bug.cgi?id=370429
Bug 370429 - Throws eclipselink-proprietry DatabaseException instead of 
JPA-compliant PersistenceException

This fix causes JPA query methods getResultList, getSingleResult, 
execute, executeUpdate and EclipseLink's getResultCollection to wrap 
RuntimeExceptions in PersistenceExceptions and mark the transaction for 
rollback.  It includes a few test changes where EclipseLInk native 
exceptions were expected to be thrown that now receive 
PersistenceException instances wrapping the underlying cause.

Reviewed by Guy Pelletier
Checked into Main (2.5)