HDFS-4377. Some trivial DN comment cleanup. Contributed by Eli Collins


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1431754 13f79535-47bb-0310-9956-ffa450edef68
HDFS-2908. Add apache license header for StorageReport.java. (Brandon Li via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1431837 13f79535-47bb-0310-9956-ffa450edef68