Stepan Salenikovich authored Jan 27, 2015 and Guillaume Roguez committed Jan 28, 2015

If upnp finds a device on the network but it cannot determine
that it is a valid upnp device nor a valid IGD device, do not
try to use it.

Also gets rid of potential memory leak if chooseIGD() crashes.

Refs #64828

Change-Id: Ibe0895ec8de043f7fcd1a1e9aa36e5b766091008