Stop background process when we stop workflow

At this time if we have to stop a workflow we still have to manually kill a running step from Linux and then possibly change some values in Bedrock MySQL database. We don't see it as a good approach of stopping a process started by Bedrock. We still request a capability to fully and correctly stop a Bedrock workflow from Bedrock rather then us doing it manually and then manually correcting Bedrock MySQL databases.

So, when we stop a workflow, any background process like hadoop job or shell script should also get stopped.