ConfigInfo.cpp:   BUG#12028, cannot use default section for hostname in cluster config   made clearer error message
ConfigInfo.cpp:
  BUG#12028, cannot use default section for hostname in cluster config
  made clearer error message


ndb/src/mgmsrv/ConfigInfo.cpp:
  BUG#12028, cannot use default section for hostname in cluster config
  made clearer error message

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