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

placrosse/ImpalaToGo,AtScaleInc/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo,andybab/Impala,andybab/Impala,ImpalaToGo/ImpalaToGo,AtScaleInc/Impala,ImpalaToGo/ImpalaToGo,andybab/Impala,gistic/PublicSpatialImpala,gistic/PublicSpatialImpala,placrosse/ImpalaToGo,ImpalaToGo/ImpalaToGo,andybab/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,andybab/Impala,andybab/Impala,placrosse/ImpalaToGo,gistic/PublicSpatialImpala,AtScaleInc/Impala,AtScaleInc/Impala,ImpalaToGo/ImpalaToGo,AtScaleInc/Impala,placrosse/ImpalaToGo,AtScaleInc/Impala,gistic/PublicSpatialImpala,ImpalaToGo/ImpalaToGo