This is for compatibility with docker containers. Before this patch,
when the scripts were run on the docker host, the scripts would try
to kill the mini-cluster in the docker containers and fail because they
didn't have permissions (the user is different). Now the scripts will
only try to kill mini-cluster processes that were started by the current
user.
Also some psutil availability checks were removed because psutil is now
provided by the python virtualenv.
Change-Id: Ida371797bbaffd0a3bd84ab353cb9f466ca510fd
Reviewed-on: http://gerrit.cloudera.org:8080/1541
Reviewed-by: Casey Ching <casey@cloudera.com>
Tested-by: Internal Jenkins