svn merge -c 1377943 FIXES: MAPREDUCE-4579. Split TestTaskAttempt into two so as to pass tests on jdk7. Contributed by Thomas Graves


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1531047 13f79535-47bb-0310-9956-ffa450edef68