Fixed failing build and test

Seems like I have rushed home a bit to hasty :P
Revert "The networkconfigurator does now also assign the mac addresses"

This reverts commit 087855daee3135c10d7f5b5ee85df6f77ad62d1c.
ARA does now again use IPv4 addresses (instead of MAC)

Address resolution is done via ARANetworkConfigurator. This is basically
cheating and only a temporary solution as we need to fix our issues with
ARP

Note: This basically reverts commit 2a230c78ae0fe54c2592c3986a827f1bc1765b26
Fixed bug with packet broadcast
The OMNeTAddresses are again displayed as [n] with n beeing the number of the node and also the fourth byte of the IPv4 address
Traffic is now sent immediately at simulation start of scenario05
The traffic generator can now send a configurable amount of packets
Fixed another ARA bug: the list of known intermediate nodes for a destination has not been reset when a new route discovery was started