Add Apache license header to StreamPumper.java missing in HDFS-2179 commit.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1153940 13f79535-47bb-0310-9956-ffa450edef68

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/ha/StreamPumper.java

@@ -1,3 +1,20 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.apache.hadoop.hdfs.server.namenode.ha;
 
 import java.io.BufferedReader;
@@ -70,4 +87,4 @@ class StreamPumper {
       }
     }
   }
-}
+}