Hackery to make sure that Plab slices always have boss/ops in their hosts
file: we return info for boss/ops in the "hostnames" command, but only if the command would have otherwise returned something. This is because the default hosts file we distribute in the rootball already has boss/ops in it. But if, during bootup, tmcd returns hostname info, that hosts file gets overwritten and boss/ops info gets lost. I could just grep out the info from the original hosts file and transfer it to the one we are building, but what do I grep for: "boss", "ops", "emulab.net"? Don't really want to hardwire any of those in the client-side script. By returning this info via tmcd, I also don't have to modify the client-side and thus don't need to build a new rootball!
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