Specify correct name for virtio net nic device
Specify correct name for virtio net nic device

With VirtualBox 5.0.14r105127, 'virtio-net' is not a valid name for the option. The correct option appears to be 'virtio'.

Signed-off-by: Michael A. Smith <73cd00167958529061194e94a399b7d54058c4e8@syapse.com>

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