Refactored ethutil.Config.Db out

cmd/ethereum/main.go

cmd/ethtest/main.go

cmd/evm/main.go

cmd/mist/bindings.go

cmd/mist/gui.go

cmd/utils/cmd.go

core/block_processor.go

core/chain_manager.go

core/chain_manager_test.go

core/genesis.go

core/helper_test.go

core/transaction_pool_test.go

core/types/block.go

core/types/derive_sha.go

eth/backend.go

ethutil/config.go

javascript/javascript_runtime.go

miner/miner.go

pow/ar/block.go

pow/ar/ops.go