Merged revisions 295710 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

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  r295710 | russell | 2010-11-19 18:45:51 -0600 (Fri, 19 Nov 2010) | 29 lines
  
  Fix cache of device state changes for multiple servers.
  
  This patch addresses a regression where device states across multiple servers
  were not being processing completely correctly.  The code works to determine
  the overall state by looking at the last known state of a device on each
  server.  However, there was a regression due to some invasive rewrites of how
  the cache works that led to the cache only storing the last device state change
  for a device, regardless of which server it was on.
  
  The code is set up to cache device state change events by ensuring that each
  event in the cache has a unique device name + entity ID (server ID).  The code
  that was responsible for comparing raw information elements (which EID is)
  always returned a match due to a memcmp() with a length of 0.
  
  There isn't much code to fix the actual bug.  This patch also introduces a new
  CLI command that was very useful for debugging this problem.  The command
  allows you to dump the contents of the event cache.
  
  (closes issue #18284)
  Reported by: klaus3000
  Patches:
        issue18284.rev1.txt uploaded by russell (license 2)
  Tested by: russell, klaus3000
  
  (closes issue #18280)
  Reported by: klaus3000
  
  Review: https://reviewboard.asterisk.org/r/1012/
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.8@295711 f38db490-d61c-443f-a65b-d21fe96a405b

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