HDFS-5837. dfs.namenode.replication.considerLoad should consider decommissioned nodes. Contributed by Tao Luo.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1566413 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4370. Fix typo Blanacer in DataNode. Contributed by Chu Tong.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1566425 13f79535-47bb-0310-9956-ffa450edef68