Use seal-duration in calculating the earliest StartEpoch #4337
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Problem
A basic filter was added that would reject storage deals that were more than 7 days in the future from the current chain head, but didn't take into consideration the seal duration configured by the miner.
Solution
Use the seal duration + 7 days as the first cut rejection criteria.
Addresses https://github.com/filecoin-project/lotus/pull/4173/files#r503249607