Support for 25/40Gbps interfaces via ethtool for Linux clientside.
Also, rework the rc.ifc code that we generate a bit. We were "falling back" to 100Mbps if we didn't recognize the speed; now we autoconfig (like we do for FreeBSD). We also now try autoconfig for mii-tool (which of course will never be used again, but gotta be correct). We explicitly warn for speeds that mii-tool does not support, instead of doing something.
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