Remove warn log when receiving pre-prepare msg for future block #1280
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It is perfectly normal for a node to eventually receive an istanbul pre-prepare for a future block. The code already handles this case and prints an INFO log msg to let the operator know that this msg will be dealt with later.
However, the code also ends up logging a WARN msg for this scenario. This can be misleading. We recently spent some time trying to understand what was going on only to realise it was an expected scenario.
This change prevents the WARN msg when we are dealing with a
ErrFutureBlock
type error.