HDFS-14207. ZKFC should catch exception when ha configuration missing. Contributed by Fei Hui.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSZKFailoverController.java

@@ -189,9 +189,9 @@ public static void main(String args[])
     
     GenericOptionsParser parser = new GenericOptionsParser(
         new HdfsConfiguration(), args);
+    try {
       DFSZKFailoverController zkfc = DFSZKFailoverController.create(
           parser.getConfiguration());
-    try {
       System.exit(zkfc.run(parser.getRemainingArgs()));
     } catch (Throwable t) {
       LOG.error("DFSZKFailOverController exiting due to earlier exception "