JBTM-2164 Update to use the cut command to get the jboss-as version
Added new threading hammer test.

Also tidied up comment.
https://issues.jboss.org/browse/JBTM-2088

Updated test to reflect some docs examples.
[JBTM-2110] Allow jobs to set extra qa system properties
[JBTM-2110] Add configurable command line arg to QA tasks
Merge branch 'JBTM-2110'