Change to how links involving shared nodes are done; whenever a shared
nodes is selected, those links must use vlan encap. Since shared node selection is not done until late, we end up goaing back and modifying the encap type and forcing a vlan to be created. This is done cause the shared nodes (openvz) do not support veth encap, and so arp causes leakage between experiments on the same node that have common IP addresses.
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