update CHANGES.txt for HDFS-7430, HDFS-7721, HDFS-7686
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/63847077
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/63847077
Diff:
update CHANGES.txt for HDFS-7430, HDFS-7721, HDFS-7686
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/63847077
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/63847077
Diff: