BZ-1055519 - Invalid shutdown of TimerService thread pool causes thread leak

(cherry picked from commit f1d7f2c315535521bd4da980d303877a114264b9)
removed version tag of commons-logging

(cherry picked from commit f3ee86df656f233dcd4afdce49948e6dba804bd1)
BZ-1055464 - Removed version of commons-logging in jbpm-tests, has to be backported to 6.0.0

(cherry picked from commit 0b30b3dff8820b76eada896a270bdfe501bf7577)