fix tests which were asserting stuff about JPA compliance for a non-JPA method

The JPA spec does not have anything to say about our beginTransaction() method

Author: gavinking

hibernate-core/src/test/java/org/hibernate/orm/test/resource/transaction/jta/JpaComplianceAlreadyStartedTransactionTest.java

@@ -45,7 +45,8 @@ public void anIllegalStateExceptionShouldBeThrownWhenBeginTxIsCalledWithAnAlread
 			Transaction tx = null;
 			try {
 				// A call to begin() with an active Tx should cause an IllegalStateException
-				tx = s.beginTransaction();
+				tx = s.getTransaction();
+				tx.begin();
 			}
 			catch (Exception e) {
 				if ( tx != null && tx.isActive() ) {

hibernate-core/src/test/java/org/hibernate/orm/test/resource/transaction/jta/NonJpaComplianceAlreadyStartedTransactionTest.java

@@ -50,7 +50,8 @@ public void setUp() {
 	public void noIllegalStateExceptionShouldBeThrownWhenBeginTxIsCalledWithAnAlreadyActiveTx() throws Exception {
 		tm.begin();
 		try (Session s = openSession()) {
-			Transaction tx = s.beginTransaction();
+			Transaction tx = s.getTransaction();
+			tx.begin();
 			try {
 				s.persist( new TestEntity( "ABC" ) );
 				tx.commit();