HADOOP-10454. Provide FileContext version of har file system. (Kihwal Lee via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1584432 13f79535-47bb-0310-9956-ffa450edef68
Fixing an error in CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1584442 13f79535-47bb-0310-9956-ffa450edef68