vdaf: Make prep steps symmetric #404
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cjpatton
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In DAP-02, the Helper sends the Leader its prep share and the Leader computes the prep message; in DAP-07, the Leader sends the Helper its prep share and the Helper computes the prep message. To facilitate this, update `vdaf::prio2` and `vdaf::prio3` so that either the Leader or the Helper can compute the prep message.
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Stacked on #402.
Partially addresses #350.
In DAP-02, the Helper sends the Leader its prep share and the Leader computes the prep message; in DAP-07, the Leader sends the Helper its prep share and the Helper computes the prep message. To facilitate this, update
vdaf::prio2andvdaf::prio3so that either the Leader or the Helper can compute the prep message.