HPCC-12093 added 'kill_process_by_name()', 'kill_component()', clea...

Kill init_<component>
Kill component processes
@jakesmith using asynchronous ssh commands with the cleanup_thorslaves function to handle dealing with potential orphaned thorslaves.  The thorslaves specific to a component are identified through the /var/lib/HPCCSystems/${compName}/thorgroup.slave file that is on the thormasters node.  If there's a cleaner way to do this please give me a heads up.