svn merge -c 1458741 from trunk for MAPREDUCE-5075. DistCp leaks input file handles since ThrottledInputStream does not close the wrapped InputStream.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1458747 13f79535-47bb-0310-9956-ffa450edef68