Remove a datanode from cluster if include list is not empty and this datanode 
is removed from both include and exclude lists
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                 Key: HDFS-1773
                 URL: https://issues.apache.org/jira/browse/HDFS-1773
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 0.20.203.1
         Environment: branch-20-security

            Reporter: Tanping Wang
            Assignee: Tanping Wang
             Fix For: 0.20.4


Our service engineering team who operates the clusters on a daily basis founds 
it is confusing that after a data node is decommissioned, there is no way to 
make the cluster forget about this data node and it always remains in the dead 
node list.

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