rpc: tx receipt don't contain events (#580)

* tx receipt don't contains events

- Should convert tx hash when query transaction logs

* tx index should start from 0

ethereum/rpc/backend/backend.go

@@ -370,7 +370,7 @@ func (e *EVMBackend) HeaderByHash(blockHash common.Hash) (*ethtypes.Header, erro
 // It returns an error if there's an encoding error.
 // If no logs are found for the tx hash, the error is nil.
 func (e *EVMBackend) GetTransactionLogs(txHash common.Hash) ([]*ethtypes.Log, error) {
-	tx, err := e.clientCtx.Client.Tx(e.ctx, txHash.Bytes(), false)
+	tx, err := e.GetTxByEthHash(txHash)
 	if err != nil {
 		return nil, err
 	}

x/evm/keeper/state_transition.go

@@ -168,7 +168,6 @@ func (k *Keeper) ApplyTransaction(tx *ethtypes.Transaction) (*types.MsgEthereumT
 	// set the transaction hash and index to the impermanent (transient) block state so that it's also
 	// available on the StateDB functions (eg: AddLog)
 	k.SetTxHashTransient(txHash)
-	k.IncreaseTxIndexTransient()
 
 	if !k.ctxStack.IsEmpty() {
 		panic("context stack shouldn't be dirty before apply message")
@@ -186,6 +185,8 @@ func (k *Keeper) ApplyTransaction(tx *ethtypes.Transaction) (*types.MsgEthereumT
 		return nil, stacktrace.Propagate(err, "failed to apply ethereum core message")
 	}
 
+	k.IncreaseTxIndexTransient()
+
 	res.Hash = txHash.Hex()
 	logs := k.GetTxLogsTransient(txHash)