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
HADOOP-8562. Merge r1457069 for HDFS-4604, r1459514 for YARN-488, r1459520 for YARN-490, r1459526 for YARN-491, r1459544 for MAPREDUCE-5078 and r1459573 for HDFS-4607

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1485911 13f79535-47bb-0310-9956-ffa450edef68