wrong event flushing when suspending/resuming tx

When committing the temporary tx, the transactional core session wrapper act as it was the main tx that were ending. The thread local is reset and event bundles are flushed.

• there is no tx discriminator in event bundles
• remaining events will be discarded until a new thread will flush them

For these reasons, at this time, it is not possible to make use of the suspend/resume logic of the tx manager.