Falcon post processing action should use Oozie prepared configuration

Without this, in an environment with NN-HA or security setup, the postprocessing action will fail accdssing the filesystem

Failing Oozie Launcher, Main class [org.apache.oozie.action.hadoop.JavaMain], main() threw exception, java.lang.IllegalArgumentException: java.net.UnknownHostException: nameservice
org.apache.oozie.action.hadoop.JavaMainException: java.lang.IllegalArgumentException: java.net.UnknownHostException: nameservice
at org.apache.oozie.action.hadoop.JavaMain.run(JavaMain.java:59)
at org.apache.oozie.action.hadoop.LauncherMain.run(LauncherMain.java:47)
at org.apache.oozie.action.hadoop.JavaMain.main(JavaMain.java:35)
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:236)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
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:1657)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.lang.IllegalArgumentException: java.net.UnknownHostException: nameservice
at org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:377)
at org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:310)
at org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:176)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:678)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:619)
at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:149)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2653)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:92)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2687)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2669)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:371)
at org.apache.falcon.hadoop.HadoopClientFactory$1.run(HadoopClientFactory.java:200)
at org.apache.falcon.hadoop.HadoopClientFactory$1.run(HadoopClientFactory.java:198)
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:1657)
at org.apache.falcon.hadoop.HadoopClientFactory.createFileSystem(HadoopClientFactory.java:198)
at org.apache.falcon.hadoop.HadoopClientFactory.createProxiedFileSystem(HadoopClientFactory.java:153)
at org.apache.falcon.hadoop.HadoopClientFactory.createProxiedFileSystem(HadoopClientFactory.java:145)
at org.apache.falcon.workflow.WorkflowExecutionContext.serialize(WorkflowExecutionContext.java:313)
at org.apache.falcon.workflow.WorkflowExecutionContext.serialize(WorkflowExecutionContext.java:299)
at org.apache.falcon.workflow.FalconPostProcessing.run(FalconPostProcessing.java:49)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.falcon.workflow.FalconPostProcessing.main(FalconPostProcessing.java:39)
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.JavaMain.run(JavaMain.java:56)
... 15 more
Caused by: java.net.UnknownHostException: nameservice
... 44 more

In the above stack trace it is clear that we are using non-HA proxy because the configuration used does not have the HA information