Fix random MAC address on reboot or when a VM/LXC is stopped or started. #96
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I noticed that the raspberry's MAC changed on every reboot or when a container/vm is started. Nothing too problematic, but this requires other devices to update their ARP table more often than needed.
This PR sets the MAC of vmbr0 to the one of eth0 in the network config. This should fix the issue for new users. Old users need to append their
/etc/network/interfaceswithFrom my knowledge, it is required to set the MAC of vmbr0 to one of the bridged ports (in this case eth0). Else it gets randomly generated, and the set address is ignored.