Fix more deadlocks in chan_iax2 that were introduced by making frame handling

and scheduling multi-threaded.  Unfortunately, we have to do some expensive
deadlock avoidance when queueing frames on to the ast_channel owner of the IAX2
pvt struct.  This was already handled for regular frames, but ast_queue_hangup
and ast_queue_control were still used directly.  Making these changes introduced
even more places where the IAX2 pvt struct can disappear in the context of a
function holding its lock due to calling a function that has to unlock/lock it
to avoid deadlocks.  I went through and fixed all of these places to account for
this possibility.
(issue #10362, patch by me)


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@79756 f38db490-d61c-443f-a65b-d21fe96a405b

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