Fixed error-reporting: errors reported by Hibernate are no longer swallowed

Fixed error-reporting: errors reported by Hibernate are no longer swallowed

Renamed the H2-databases in the OSGI-tests of the Hibernate-Tutorials,
because it showed, that these tests are failing, but only, if they are
executed together through the parent-directory of the tutorial, but not,
if they are executed separatly, which indicates timing issues in connection
with the shutdown of the database.