Add support for configuring widearea nodes statically (no dhcp), according
to info in /etc/emulab/waconfig. Pretty much like how planetlab does it -- each node's dongle has to have a specific set of info. The key difference from plab is that widearea nodes that boot off dhcp don't have to have this file -- if it doesn't exist, they do everything via dhcp and then tmcc just like normal.
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