HDFS-4329. DFSShell issues with directories with spaces in name (Cristina L. Abad via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1516908 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4947. Merging change r1517040 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1517049 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5478. TeraInputFormat unnecessarily defines its own FileSplit subclass (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1517055 13f79535-47bb-0310-9956-ffa450edef68