HDFS-5495. Remove further JUnit3 usages from HDFS. Contributed by Jarek Jarcec Cecho.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1540916 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-1176. FixedLengthInputFormat and FixedLengthRecordReader (Mariappan Asokan and BitsOfInfo via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1540932 13f79535-47bb-0310-9956-ffa450edef68
YARN-1400. Merging change r1540938 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1540940 13f79535-47bb-0310-9956-ffa450edef68