revise nack handling in queue (for dlx)

- with the changes introduced in bug 24750, the "lost" message count
  logged was misleading since it would not include any messages still
  pending confirmation from other queues. Fix that.
- normal queue terminations are not log worthy
- splitting log information across two entries loses context,
  i.e. other log entries might appear inbetween. So now we collate all
  the information into a single log entry.
- saying that messages were "lost" is misleading - we simply don't
  know what happened to them. Make this clear(er).

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