Merged revisions 341580 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/10

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  r341580 | irroot | 2011-10-20 19:13:23 +0200 (Thu, 20 Oct 2011) | 15 lines
  
  Add option to check state when state is unknown
  
  r341486 reverts r325483 this is a rework of the patch.
  optimize to minimize load.
  
  add option check_state_unknown to control whether a member with unknown
  device state is checked there is a small % chance that calls will be sent
  to the member when they on a call.
  
  app_queue will see a device with unknown state as available and does not 
  try verify the state without this option enabled.
  
  Review: https://reviewboard.asterisk.org/r/1535/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@341583 65c4cc65-6c06-0410-ace0-fbb531ad65f3