evm: various fixes (#319)

* evm: use prefix stores, move SetBlockBloom to EndBlock, bug fixes

* add logs to genesis state

* log tests

* commit and finalize on InitGenesis

* validate TransactionLogs

* changelog

* fix test-import

* fix lint

* add more tests

app/ethermint.go

@@ -147,10 +147,9 @@ func NewEthermintApp(
 	keys := sdk.NewKVStoreKeys(
 		bam.MainStoreKey, auth.StoreKey, bank.StoreKey, staking.StoreKey,
 		supply.StoreKey, mint.StoreKey, distr.StoreKey, slashing.StoreKey,
-		gov.StoreKey, params.StoreKey, evidence.StoreKey, evm.CodeKey, evm.StoreKey,
+		gov.StoreKey, params.StoreKey, evidence.StoreKey, evm.StoreKey,
 		faucet.StoreKey,
 	)
-	blockKey := sdk.NewKVStoreKey(evm.BlockKey)
 
 	tkeys := sdk.NewTransientStoreKeys(params.TStoreKey)
 
@@ -203,7 +202,7 @@ func NewEthermintApp(
 		app.subspaces[crisis.ModuleName], invCheckPeriod, app.SupplyKeeper, auth.FeeCollectorName,
 	)
 	app.EvmKeeper = evm.NewKeeper(
-		app.cdc, blockKey, keys[evm.CodeKey], keys[evm.StoreKey], app.AccountKeeper,
+		app.cdc, keys[evm.StoreKey], app.AccountKeeper,
 		app.BankKeeper,
 	)
 	// TODO: use protobuf
@@ -299,10 +298,6 @@ func NewEthermintApp(
 	app.MountKVStores(keys)
 	app.MountTransientStores(tkeys)
 
-	// Mount block hash mapping key as DB (no need for historical queries)
-	// TODO: why does this need to be always StoreTypeDB?
-	app.MountStore(blockKey, sdk.StoreTypeDB)
-
 	// initialize BaseApp
 	app.SetInitChainer(app.InitChainer)
 	app.SetBeginBlocker(app.BeginBlocker)