Temporary patch to solve the non-connected veth interface problems,
which happens on lans of vnodes that are split between pnodes. assign spits out trivial links for the nodes collocated on the pnodes, but if there are two groups of vnodes on different pnodes, the connection is not explicit in the link statements that assign gives (techinically, they should not be trivial links, but Rob is still thinking that over). Fortunately, I have enough info from assign to extend the vlan and to patch the veth interfaces afterwards. Its god-awful stuff, and I hope I can strip it out soon.
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