Fix bad import in HADOOP-615.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1156860 13f79535-47bb-0310-9956-ffa450edef68

hdfs/src/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -60,12 +60,12 @@ import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
 import org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException;
+import org.apache.hadoop.hdfs.util.CyclicIteration;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.net.CachedDNSToSwitchMapping;
 import org.apache.hadoop.net.DNSToSwitchMapping;
 import org.apache.hadoop.net.NetworkTopology;
 import org.apache.hadoop.net.ScriptBasedMapping;
-import org.apache.hadoop.util.CyclicIteration;
 import org.apache.hadoop.util.Daemon;
 import org.apache.hadoop.util.HostsFileReader;
 import org.apache.hadoop.util.ReflectionUtils;