[Nice] patch for TURN error 437 Allocation Mismatch

[Madaro Livio]

Hi, I send a patch for review.
The problem happen when the libnice client crashes leaving an active UDP TURN allocation.  When the libnice client is run again, after the crash, the TURN server replies with error 437 Allocation Mismatch because the previous allocation is still active on the TURN server and libnice always uses the socket port number starting from min_port  (and so the port number is the same of the port number in  the previous allocation).

The patch open the socket port starting from a random values in the range min_port-max_port to use different port number each time.

What do you think?

Regards,
Livio

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