Merged revisions 326291 via svnmerge from

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

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  r326291 | rmudgett | 2011-07-05 12:22:59 -0500 (Tue, 05 Jul 2011) | 23 lines
  
  Used auth= parameter freed during "sip reload" causes crash.
  
  If you use the auth= parameter and do a "sip reload" while there is an
  ongoing call.  The peer->auth data points to free'd memory.
  
  The patch does several things:
  
  1) Puts the authentication list into an ao2 object for reference counting
  to fix the reported crash during a SIP reload.
  
  2) Converts the authentication list from open coding to AST list macros.
  
  3) Adds display of the global authentication list in "sip show settings".
  
  (closes issue ASTERISK-17939)
  Reported by: wdoekes
  Patches:
        jira_asterisk_17939_v1.8.patch (license #5621) patch uploaded by rmudgett
  
  Review: https://reviewboard.asterisk.org/r/1303/
  
  JIRA SWP-3526
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@326321 65c4cc65-6c06-0410-ace0-fbb531ad65f3