HADOOP-14540. Replace MRv1 specific terms in HostsFileReader. Contributed by hu xiaodong.

(cherry picked from commit 300804595e5b8fd447ecb530fcd0ae5b0e59bb63)
(cherry picked from commit 6d82db40d59684fdb7fcdc6159a975b3ca483c27)

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/HostsFileReader.java

@@ -31,8 +31,8 @@ import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceStability;
 
-// Keeps track of which datanodes/tasktrackers are allowed to connect to the 
-// namenode/jobtracker.
+// Keeps track of which datanodes/nodemanagers are allowed to connect to the
+// namenode/resourcemanager.
 @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
 @InterfaceStability.Unstable
 public class HostsFileReader {