SERVER-40793 Allow transactions prepared in 4.2 with the multiple oplog transaction format commit or abort with the same format while downgrading to 4.0

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• Closed

SERVER-35882 Wait for all prepared transactions to complete and clear the transaction table, on fCV downgrade

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• Closed

SERVER-36485 ‘killSessions’ (for one session) and 'endSessions' should return a “PreparedTransactionInProgress” error if it tries to kill a session that has a prepared transaction in it

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• Closed