fix command line argument index

when execute below command

$ bin/hadoop jar simple-yarn-app-1.0-SNAPSHOT.jar com.hortonworks.simpleyarnapp.Client /bin/date 2 /apps/simple/simple-yarn-app-1.0-SNAPSHOT.jar

it will be 
args[0]: com.hortonworks.simpleyarnapp.Client
args[1]: /bin/date
args[2]: 2
args[3]: /apps/simple/simple-yarn-app-1.0-SNAPSHOT.jar