Merge changes from team/russell/iax2_frame_queue

This patch is an optimization for chan_iax2.  This module is now heavily
multi-threaded.  However, there is still a good number of globally shared
resources that prevent things from happen asynchronously.  One of those things
was the global IAX frame queue.  This queue was used to hold frames that have
been deferred for transmitting by another thread, and frames that may need to
get retransmitted.

I changed the frame queue to be per-call, since almost all of the frame queue
handling only cares about frames specific to a call number.


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@89887 f38db490-d61c-443f-a65b-d21fe96a405b

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