Stop using public IP space assigned to the DoD

Hey,
I noticed that you are using IPs from public routable IP space. Those IPs are (currently) assigned to the DoD Network Information Center. RFC1918 defines several networks that are reserved for use in private internets. As the vagrant boxes clearly use a private network (`:private_network`) they should not use public IP space (especially not IP space assigned to someone else!)

I selected a random range from the 10/8 prefix and renumbered the boxes.