RE-1501 Kill dstat before log collection
RE-1501 Kill dstat before log collection

The dstat file sometimes does not appear in the collected
job artifacts. This may be due to the process still having
the file open. We therefore ensure that the process is killed
prior to collecting the job artifacts.

rcbops/rpc-openstack,BjoernT/rpc-openstack,rcbops/rpc-openstack,BjoernT/rpc-openstack,jacobwagner/rpc-openstack,jacobwagner/rpc-openstack