Prioritize peers that support V2 RPCs in the sync loop #53
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This PR prioritizes peers that support V2 RPCs so we can make use of
MaxSendBlocks
more often, v1 peers useMaxCatchUpBlocks
which was set to 10 so we sync in batches of only 10 blocks. I kept the 3-peer-cutoff even though I'm not sure why we have that, cc @lukechampine could you explain why that's necessary (or better)?