Revert "MAPREDUCE-6565. Configuration to use host name in delegation token service is not read from job.xml during MapReduce job execution. Contributed by Li Lu."

This reverts commit f2284f44ddaa086d60b1a917b0bfff461a2f9287.

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/YarnChild.java

@@ -78,8 +78,6 @@ class YarnChild {
     // Initing with our JobConf allows us to avoid loading confs twice
     Limits.init(job);
     UserGroupInformation.setConfiguration(job);
-    // MAPREDUCE-6565: need to set configuration for SecurityUtil.
-    SecurityUtil.setConfiguration(job);
 
     String host = args[0];
     int port = Integer.parseInt(args[1]);

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java

@@ -121,7 +121,6 @@ import org.apache.hadoop.mapreduce.v2.util.MRBuilderUtils;
 import org.apache.hadoop.mapreduce.v2.util.MRWebAppUtil;
 import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.security.Credentials;
-import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.service.AbstractService;
@@ -1619,8 +1618,6 @@ public class MRAppMaster extends CompositeService {
       final JobConf conf, String jobUserName) throws IOException,
       InterruptedException {
     UserGroupInformation.setConfiguration(conf);
-    // MAPREDUCE-6565: need to set configuration for SecurityUtil.
-    SecurityUtil.setConfiguration(conf);
     // Security framework already loaded the tokens into current UGI, just use
     // them
     Credentials credentials =