update dataSource properties used in tests
Test for GRAILS-10945 Transactions break when a Hibernate TableGenerator based id generator is used
GRAILS-10945 GRAILS-11133 activate HibernateJtaTransactionManagerAdapter by setting transactionManager
so that JtaDelegate gets used in org.hibernate.engine.transaction.Isolater
workaround for h2 issue when MVCC is enabled