Arquillian core 1.6.0.Final, Jakarta EE 8.

Add `javax.transaction.Transactional` does not work, but use `UserTransaction` to begin and commit the trancation is working well.

https://github.com/hantsy/cargotracker/blob/master/src/test/java/org/eclipse/cargotracker/application/BookingServiceTest.java#L135