Make NetworkInfo work with new linux interface name scheme

Task-number: QTBUG-41283
Change-Id: I295ba589daede28dc6a75a47ca88533090bca84a
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Fixed runloopThread being uninitialized and causing a crash in destruction.

Change-Id: I2e695f872d8d43978eba0030d72ee635c36f2103
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>