Datanode could log what hostname and ports its listening on on startup
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                 Key: HDFS-882
                 URL: https://issues.apache.org/jira/browse/HDFS-882
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
    Affects Versions: 0.22.0
            Reporter: Steve Loughran
            Assignee: Steve Loughran
            Priority: Minor
             Fix For: 0.22.0


The Datanode logs the port it is listening too, but if you have having problems 
with multi-NIC systems or IPv6 grief, knowing the hostname is handy too. Also, 
it doesn't log the SSL port info.

Proposed: provide more details at the debug level

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