Merged revisions 376472 via svnmerge from

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  r376472 | wdoekes | 2012-11-19 14:03:56 -0600 (Mon, 19 Nov 2012) | 17 lines
  
  Fix most leftover non-opaque ast_str uses.
  
  Instead of calling str->str, one should use ast_str_buffer(str). Same
  goes for str->used as ast_str_strlen(str) and str->len as
  ast_str_size(str).
  
  Review: https://reviewboard.asterisk.org/r/2198
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  Merged revisions 376469 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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  Merged revisions 376470 from http://svn.asterisk.org/svn/asterisk/branches/10
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  Merged revisions 376471 from http://svn.asterisk.org/svn/asterisk/branches/11
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git-svn-id: https://origsvn.digium.com/svn/asterisk/team/mmichelson/threadpool@376479 65c4cc65-6c06-0410-ace0-fbb531ad65f3