HDFS-4827. Slight update to the implementation of API for handling favored nodes in DFSClient. Contributed by Devaraj Das.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1487093 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HADOOP-7435-trunk-gd