Make sure udev settles enough to get us network interfaces.
Ok, it seems that sometimes the network.target runs before network devices have fully finished going through udev. I think what goes on here is that udev can "settle" (meaning there are no events), but there will still be some events in the future. So now in the special networking-emulab.service, we settle AND wait for at least one auto, non-lo interface to appear via ifquery.
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