JBIDE-15020 : use meaningful monitor name when fetching stacks

Signed-off-by: Fred Bricon <fbricon@gmail.com>
JBIDE-14977 -  JBoss Central tests fail
Summer Cleanup

removed unnecessary code :
- removed unused classes (Refresh*Handler)
- replaced IJobChangeListener by JobChangedAdapters

Signed-off-by: Fred Bricon <fbricon@gmail.com>