[reSIProcate] Changed stunTest to use nonblocking socket

[Matthias Moetje - TERASENS GmbH]

Hi,
 
as proposed some time earlier I have now changed the stunTest 
function to use a nonblocking socket. Reasons are obvious:
 
- function does not return if STUN server does not answer
- application can't be shutdown properly while waiting for a socket
 
The stunTest function now has a new timeout parameter with a 
default of 5000ms.
 
Best regards,

Matthias Moetje

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