HDFS-2576. Fixed some compilation issues. Affects only branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480151 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java

@@ -18,6 +18,7 @@
 package org.apache.hadoop.net;
 
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Collection;
 import java.util.Random;
 import java.util.concurrent.locks.ReadWriteLock;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -67,6 +67,8 @@ import org.apache.hadoop.net.CachedDNSToSwitchMapping;
 import org.apache.hadoop.net.DNSToSwitchMapping;
 import org.apache.hadoop.net.NetworkTopology;
 import org.apache.hadoop.net.NetworkTopology.InvalidTopologyException;
+import org.apache.hadoop.net.Node;
+import org.apache.hadoop.net.NodeBase;
 import org.apache.hadoop.net.ScriptBasedMapping;
 import org.apache.hadoop.util.Daemon;
 import org.apache.hadoop.util.HostsFileReader;