BZ-1022944 - session-migration: NPE in SubTaskDecorator.checkSubTaskStrategies as Task.subTaskStrategy is null

(cherry picked from commit 23672ee22a94ffdaed1651abb4eb1ba22cc7a0aa)
enhanced support for kjar usage with runtime manager

(cherry picked from commit bb60d3e490e09f723fcd63fda17e0ae3ec069311)
enhanced support for kjar usage with runtime manager - kie classpath container support

(cherry picked from commit b0c81e23dc82d3d34b45068e14c4cd40df41b9af)
BZ-982643 - Executing basic processes takes much longer comparing to jbpm5 - added tx handling for deadlines

(cherry picked from commit f6e5613d17d0776eee4ae0cfb8e2c5d4cc737d8f)