Oracle: support "fast lane" member subset #563
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The fast lane subset is a subset consisting of
quorumoracles that changes on each frame. Fast lane members can, and are expected to, submit a report during the first part of the frame. Non-fast-lane members are only allowed to submit a report after the "fast-lane" part of the frame passes.This is done to encourage each oracle from the full set to participate in reporting on a regular basis, and identify any malfunctioning members.
The subset selection is implemented as a sliding window of the
quorumwidth over member indices (mod total members). The window advances by one index each reporting frame.