Ev2 RA protocols

In case folks haven't been following commits@, there's been a bit of
work on the ev2-export branch on implementing Ev2 drivers for commits.
 While we're not quite ready for it yet, at some point we'll need to
start thinking about how to marshall Ev2 drives over the wire to
waiting servers. As this design work is largely orthogonal to the
current implementation efforts, and my familiarity with our existing
protocols is pretty weak, I'd invite other folks to start thinking
about these issues and discussing them here.

(In a word: "Help!")

-Hyrum

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