HDFS-6409. Fix typo in log message about NameNode layout version upgrade. Contributed by Chen He.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1596739 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6433. Replace BytesMoved class with AtomicLong. Contributed by Benoy Antony.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1596742 13f79535-47bb-0310-9956-ffa450edef68