make refresh-namodenodes.sh refreshing all namenodes
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                 Key: HDFS-1998
                 URL: https://issues.apache.org/jira/browse/HDFS-1998
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: scripts
    Affects Versions: 0.23.0
            Reporter: Tanping Wang
            Assignee: Tanping Wang
            Priority: Minor
             Fix For: 0.23.0


refresh-namenodes.sh is used to refresh name nodes in the cluster to check for 
updates of include/exclude list.  It is used when decommissioning or adding a 
data node.  Currently it only refreshes the name node who serves the defaultFs, 
if there is defaultFs defined.  Fix it by refreshing all the name nodes in the 
cluster.

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