HADOOP-12545. Hadoop javadoc has broken links for AccessControlList, ImpersonationProvider, DefaultImpersonationProvider, and DistCp. Contributed by Arshad Mohammad.

(cherry picked from commit f94d89270464ea8e0d19e26e425835cd6a5dc5de)
(cherry picked from commit c5c663c05d9e2b562b1fad3d81f90acf50e27fe6)

 Conflicts:
	hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/package-info.java

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -18,6 +18,10 @@ Release 2.7.3 - UNRELEASED
     HADOOP-12296. when setnetgrent returns 0 in linux, exception should be
     thrown (Chang Li via jlowe)
 
+    HADOOP-12545. Hadoop javadoc has broken links for AccessControlList,
+    ImpersonationProvider, DefaultImpersonationProvider, and DistCp.
+    (Arshad Mohammad via aajisaka)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/authorize/package-info.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-@InterfaceAudience.LimitedPrivate({"HBase", "HDFS", "MapReduce"})
+@InterfaceAudience.Public
 @InterfaceStability.Evolving
 package org.apache.hadoop.security.authorize;
 import org.apache.hadoop.classification.InterfaceAudience;

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/tools/package-info.java

@@ -15,7 +15,4 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-@InterfaceAudience.Private
 package org.apache.hadoop.tools;
-import org.apache.hadoop.classification.InterfaceAudience;
-

hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/package-info.java

@@ -0,0 +1,28 @@
+/**
+ * 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.
+ */
+
+
+/**
+ * DistCp is a tool for replicating data using MapReduce jobs for concurrent
+ * copy operations.
+ *
+ * @version 2
+ */
+@InterfaceAudience.Public
+package org.apache.hadoop.tools;
+import org.apache.hadoop.classification.InterfaceAudience;