Fixing conflict with VirtualBox

[VirtualBox](https://www.virtualbox.org) sometimes creates a network interface at `/dev/vboxnet0`. On Mac 10.9 (perhaps lower as well, just haven't tested), run.sh attempts to use this interface, which seems to result in it never figuring out its mac address, and never starting a server on `:8887` or `8888`. This commit just adds `vboxnet0` to the list of exceptions (of which `vmnet` is already one, so I figured that was the place).