[PATCH] samba.netbios module Python 3 compatible

[Lumir Balhar]

Hello.

I've ported Python module samba.netbios to Python 3 compatible form.

As discussed before [0], it's really hard to write tests for modules 
like this because it works mostly with networks. I've tried to write 
some tests but I am only able test proper exceptions raising. I tested 
ported module manually on my LAN.

[0] 
https://lists.samba.org/archive/samba-technical/2017-June/120869.html 
and https://lists.samba.org/archive/samba-technical/2017-May/120863.html

Thank you and have a nice day.

Lumír