HSEARCH-562 Add JTA test with JBoss TS: Add infrastructural code for JBossTS
In particular:
- PersistenceUnitInfo builder to use Hibernate's EMF creation "in container"
- XADatasourceWrapper that does not use JNDI but use a static lookup mechanism
- create datasource holder for H2
- create JBossTSStandaloneTransactionManagerLookup (to be contributed to Hibernate Core?)