HADOP-8662. Merge r1455637 for HADOOP-9388, r1455956 for HDFS-4593, r1456060 for HDFS-4582 and r1457057 for HDFS-4603

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1485907 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5230. Bring back NLineInputFormat.createFileSplit for binary compatibility with mapred in 1.x Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1485906 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1485908 13f79535-47bb-0310-9956-ffa450edef68