Fix SecurityException when running HadoopStoreJobRunner in an oozie java action

[bitti]

Oozie adds a security manager in the launcher to trap System.exit() calls. When it's called an exception is thrown, but trapped. If the exit code is 0 it's considered a successful run.

The main method of HadoopStoreJobRunner unnecessarily catches this exception and fails a successful job by calling System.exit(1). This PR fixes this issue.

For reference: This is what the exception looks like

java.lang.SecurityException: Intercepted System.exit(0)
        at org.apache.oozie.action.hadoop.LauncherSecurityManager.checkExit(LauncherMapper.java:808)
        at java.lang.Runtime.exit(Runtime.java:107)
        at java.lang.System.exit(System.java:962)
        at voldemort.store.readonly.mr.HadoopStoreJobRunner.main(HadoopStoreJobRunner.java:287)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.oozie.action.hadoop.LauncherMapper.map(LauncherMapper.java:495)
        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:428)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:160)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:415)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:155)

Try '--help' for more information.Intercepting System.exit(1)
Failing Oozie Launcher, Main class [voldemort.store.readonly.mr.HadoopStoreJobRunner], exit code [1]