Use real physical control net device in /var/emulab/boot/controlif .
Somehow we had decided to to put br-ex into this file. That is technically correct, but not from slothd's perspective, since virtual interfaces can plug into br-ex but not inject traffic from the host br-ex interface... so we miss that traffic. And we can't miss it. (We still stash br-ex into /var/run/cnet... creating this mixed message is not ideal, but we have to fix the slothd control net data collection issue, which means lying to /var/emulab/boot/controlif.)
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