Add servicemix bundle for javax.scripting engine
Add unit test covering JPA Tx Manager using Spring & jBPMN
(cherry picked from commit 7e1e2e383fd0bf3d75d9227c5dbab23d6611a79d)
Add logger for org.jbpm.services.task.persistence - debug which allow to verify in the unit test which TxManager is used
(cherry picked from commit 5c39e3293d301745525edd815d64d79c0d6b41fa)
allow event listeners to be registered on ksession when persistence is enabled