Use separate waiter maps for parents and top-level TXes #4291
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I previously thought it was okay to re-use the same Waiter for both parent TXes and top-level TXes, but this was wrong because wait_for_parents can start waiting before the top-level wait, which makes
is_firstfalse at the top level. (This was only an issue when killing and restarting a node mid-sync).