conf: Update oui.conf using scripts/update-oui.py

Update created using the command inside the netsniff-ng source tree:

$ ./scripts/update-oui.py -f -o src/conf/oui.conf
Updating OUI information in src/conf/oui.conf from http://standards.ieee.org/develop/regauth/oui/oui.txt...
17315 OUIs written to src/conf/oui.conf

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>