HDFS-11000. webhdfs PUT does not work if requests are routed to call queue. Contributed by Kihwal Lee.

(cherry picked from commit 9454dc5e8091354cd0a4b8c8aa5f4004529db5d5)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java

@@ -330,7 +330,7 @@ public class NamenodeWebHdfsMethods {
     } else {
       //generate a token
       final Token<? extends TokenIdentifier> t = generateDelegationToken(
-          namenode, ugi, userPrincipal.getName());
+          namenode, ugi, null);
       delegationQuery = "&" + new DelegationParam(t.encodeToUrlString());
     }
     final String query = op.toQueryString() + delegationQuery