HADOOP-10866. RawLocalFileSystem fails to read symlink targets via the stat command when the format of the stat command uses non-curly quotes (yzhang via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612429 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1612427 from trunk for HDFS-6680. BlockPlacementPolicyDefault does not choose favored nodes correctly.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612430 13f79535-47bb-0310-9956-ffa450edef68