[reSIProcate] Patch: Adds support to queue NITs

[Kobi Eshun <kobi@xxxxxxxxxxxxxx>]

Hi,

Please consider the attached patch against HEAD. It implements  
queueing for any outgoing REFER, INFO, or MESSAGE requests associated  
with an InviteSession. If a non-INVITE transaction is already in  
progress when refer(), info() or message() is invoked, the resulting  
SIP request is pushed into a FIFO. Queued requestes are shipped  out  
one at a time without overlap as final responses are processed.

For INFO and MESSAGE, the new behavior is semantically equivalent to  
before (queueing notwithstanding).

For REFER, the previous code locked out a new request until the  
onReferAccepted() callback fired on the first NOTIFY. The patch  
changes the end of that lockout to coincide with the final response  
for the REFER itself. The new lockout period should be shorter, and  
proved easier to code. Does anyone see a problem with this?

The new queue should also work with the DUM command API, but I did  
not test it.

Cheers,
--
kobi

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