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Per discussion in HDFS-7382, I'm filing this jira as a follow-up, to replace check "port number < 1024" with shared isPrivilegedPort method.
Thanks Chris Nauroth for the work on HDFS-7382 and suggestion there.
DataNode in secure mode may throw NullPointerException if client connects before DataNode registers itself with NameNode.
Fix block protocol so that Datanodes don't require root or jsvc