Add tests that enable JPA entity class bytecode enhancement

Pick a few unit tests and add the following settings to enable entity bytecode enhancement:

<property name="hibernate.enhancer.enableDirtyTracking" value="true"/>
<property name="hibernate.enhancer.enableLazyInitialization" value="true"/>
<property name="hibernate.enhancer.enableAssociationManagement" value="true"/>

Steps to reproduce:

• Build WildFly
• cd testsuite/integration/basic
• mvn clean install -Dtest=org.jboss.as.test.integration.jpa.transaction.TransactionTestCase
• mvn clean install -Dtest=org.jboss.as.test.integration.jpa.hibernate.management.ManagementTestCase
• mvn clean install -Dtest=org.jboss.as.test.integration.jpa.entitylistener.EntityListenersTestCase
• mvn clean install -Dtest=org.jboss.as.test.integration.jpa.secondlevelcache.JPA2LCTestCase

Note that the org.jboss.as.test.integration.jpa.transaction.TransactionTestCase test should pass since javassist is specified in the persistence.xml but that seems to be ignored (we still get the ByteBuddy failure).

To workaround failures, prestart wildfly via: ./standalone.sh -Dhibernate.bytecode.provider=javassist and then run tests.