Merged revisions 324174 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r324174 | rmudgett | 2011-06-17 13:23:19 -0500 (Fri, 17 Jun 2011) | 5 lines
  
  Add header string to libpri debug output.
  
  Add header string to libpri debug output so the libpri output can be
  found/extracted easier from huge debug trace files.
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@324175 65c4cc65-6c06-0410-ace0-fbb531ad65f3