blockchain: Remove easiest diff checkpoint checks. #2012
Merged
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This requires PR #2008.
These checks are no longer necessary since they applied to orphans and blockchain no longer handles orphans. Further, orphans are currently otherwise limited by the block manager and this is another step towards the overall effort to decouple the connection code from the download logic. Ultimately, the goal is to remove orphan handling altogether.
Finally, it also has the added benefit of further minimizing the reliance on trusted known good checkpoints.