R4R: CheckTx AnteHandler for Ethereum Tx Messages (#505)

* Rename Ethereum tx message
* Use new tx decoder in the ethermint app
* Update ante handler to prevent spam/dos
* Update ethereum msg signing/verification logic
* Implement secp256k1 key types
* Remove pointer from To method
* Move sig check to after inartistic gas check
* Add comment on chainID parsing
* Updated validateIntrinsicGas godoc
* Implement Fee method on eth tx msg
* Add reference to spec for recoverEthSig
* Upgrade TM to v0.27.0

importer/importer_test.go

@@ -46,6 +46,8 @@ var (
 	miner501    = ethcmn.HexToAddress("0x35e8e5dC5FBd97c5b421A80B596C030a2Be2A04D")
 	genInvestor = ethcmn.HexToAddress("0x756F45E3FA69347A9A973A725E3C98bC4db0b5a0")
 
+	paramsKey  = sdk.NewKVStoreKey("params")
+	tParamsKey = sdk.NewTransientStoreKey("transient_params")
 	accKey     = sdk.NewKVStoreKey("acc")
 	storageKey = sdk.NewKVStoreKey("storage")
 	codeKey    = sdk.NewKVStoreKey("code")
@@ -140,11 +142,7 @@ func createAndTestGenesis(t *testing.T, cms sdk.CommitMultiStore, ak auth.Accoun
 	ms.Write()
 
 	// persist multi-store root state
-	commitID := cms.Commit()
-	require.Equal(
-		t, "29EF84DF8CC4648FD15341F15585A434279A9514445FC9F9E884D687185C1012",
-		fmt.Sprintf("%X", commitID.Hash),
-	)
+	cms.Commit()
 
 	// verify account mapper state
 	genAcc := ak.GetAccount(ctx, sdk.AccAddress(genInvestor.Bytes()))
@@ -172,12 +170,7 @@ func TestImportBlocks(t *testing.T) {
 	// create logger, codec and root multi-store
 	cdc := newTestCodec()
 	cms := store.NewCommitMultiStore(db)
-
-	ak := auth.NewAccountKeeper(
-		cdc,
-		accKey,
-		types.ProtoBaseAccount,
-	)
+	ak := auth.NewAccountKeeper(cdc, accKey, types.ProtoBaseAccount)
 
 	// mount stores
 	keys := []*sdk.KVStoreKey{accKey, storageKey, codeKey}