corrected spelling in CHANGES.txt for MAPREDUCE-4397 entry and moved it from 1.2.0 to 1.1.2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1439267 13f79535-47bb-0310-9956-ffa450edef68
finish submission for MAPREDUCE-4396.  Include unit test from HADOOP-8734.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1@1439271 13f79535-47bb-0310-9956-ffa450edef68