MAPREDUCE-4994. Addendum fixing testcases failures. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1446043 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9297. remove old record IO generation and tests. (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1446045 13f79535-47bb-0310-9956-ffa450edef68