core: adjust reserved gas for system transactions in non-checkpoint block

[andicrypt]

Currently, reserved gas for system transaction is hardcoded as 10M gas. (

ronin/miner/worker.go

Lines 879 to 890 in 95e3707

	// If the gas pool is newly created, reserve some gas for system transactions
	if w.chainConfig.Consortium != nil {
	if err := w.current.gasPool.SubGas(params.ReservedGasForSystemTransactions); err != nil {
	log.Error(
	"Failed to reserve gas for system transactions",
	"pool", w.current.gasPool,
	"reserve", params.ReservedGasForSystemTransactions,
	"error", err,
	)
	return true
	}
	}

). However, only the checkpoint block - 1 (the block at the end of epoch) needs to reserve that much (because wrap up epoch transaction requires a lot of gas), it is necessary to adjust the logic to reserve lower gas in normal block or higher gas in checkpoint block.

[minh-bq]

Please change the prefix in commit title to follow the convention

[minh-bq]

We need to add check for pool.chainconfig.Consortium != nil to avoid crash on unit test