replacing umlaute and fixing address in headers Haldeneggsteig -> Universitaetsstrasse

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

libnet: added functionality to request ARP lookup sent from default q

In some cases we require the need to look up a MAC address from
another core than where the default networking queue is running.
This sends a message to the network stack started by the driver
and forces an ARP lookup request and waits for its completion
using Octopus.

Signed-off-by: Roni Häcki <roni.haecki@inf.ethz.ch>

Added the forgotten interface file net_ARP.if