Fixed issue where run-workload was exiting with error code 0 when error occured
Fixed issue where run-workload was exiting with error code 0 when error occured

Change-Id: I0872fef9a16b19b4a8ac273c2f28a415eb3d1dc2
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4030
Reviewed-by: Taras Bobrovytsky <72e4a6fc4c5ef23f318dc209e8402725249a5676@cloudera.com>
Tested-by: jenkins
(cherry picked from commit fd5683662ed632b22a0267720faeb4d7870cb667)
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4055

michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala