John Baldwin de3622188a Add in MI implementations of the KTR trace buffer ddb commands. The
commands have also been slightly updated as follows:
- Use ktr_idx to find the newest entry rather than walking the buffer
  comparing timespecs.  Timespecs are not always unique after the change
  to use getnanotime(9).
- Add a new verbose setting.  When the verbose setting is on, then the
  timestamp is printed with each message.  If KTR_EXTEND is on, then the
  filename and line number are output as well.  By default this option is
  off.  It can be turned on with the 'v' modifier passed to the 'tbuf'
  and 'tall' commands.  For the 'tnext' command, the 'v' modifier toggles
  the verbose mode.
- Only display the cpu number for each message on SMP systems.
- Don't display anything for an empty entry that hasn't been used yet.
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