[Nice] Compatibility with MS Office Communicator 2007 R2

[Jakub Adam]

Hi Youness,

here are my updated patches. I think the first two are ready for commit,
you reviewed them earlier and I made only minor changes to make them
applicable to current git master.

TURN support is also mostly finished, I was successful making call to
Office Communicator via media relay but I need to make some more testing
and check if TURN refresh works. I do not expect the code to change
much, you can review the current state of implementation and point out
problems you see.

The support of older TURN draft already present in libnice was enough to
make things work with all versions of MSOC, so I didn't have need to use
RFC 5766 code from Marcus Lundblad. Perhaps I will implement support on
top of newer version of the protocol later, but I see no direct benefit
from doing it now.

There were some API changes needed, I added one parameter to
stun_message_validate_buffer_length() and some new variables to
stun_agent_t, but probably I will need to put the MS connection ID stuff
somewhere else so stun_usage_turn_create_refresh() can also have access
to it.

I will try to post more updates ASAP during the week.

Jakub


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