Set GasAdjustment in CLIContext when handling HTTP requests

This is to address @alexanderbez's comments

client/utils/rest.go

@@ -3,6 +3,7 @@ package utils
 import (
 	"fmt"
 	"net/http"
+	"strconv"
 )
 
 const (
@@ -28,3 +29,17 @@ func WriteSimulationResponse(w *http.ResponseWriter, gas int64) {
 func HasDryRunArg(r *http.Request) bool {
 	return r.URL.Query().Get(queryArgDryRun) == "true"
 }
+
+// ParseFloat64OrReturnBadRequest converts s to a float64 value. It returns a default
+// value if the string is empty. Write
+func ParseFloat64OrReturnBadRequest(w *http.ResponseWriter, s string, defaultIfEmpty float64) (n float64, ok bool) {
+	if len(s) == 0 {
+		return defaultIfEmpty, true
+	}
+	n, err := strconv.ParseFloat(s, 64)
+	if err != nil {
+		WriteErrorResponse(w, http.StatusBadRequest, err.Error())
+		return n, false
+	}
+	return n, true
+}

client/utils/utils.go

@@ -12,11 +12,6 @@ import (
 	"github.com/tendermint/tendermint/libs/common"
 )
 
-// DefaultGasAdjustment is applied to gas estimates to avoid tx
-// execution failures due to state changes that might
-// occur between the tx simulation and the actual run.
-const DefaultGasAdjustment = 1.0
-
 // SendTx implements a auxiliary handler that facilitates sending a series of
 // messages in a signed transaction given a TxContext and a QueryContext. It
 // ensures that the account exists, has a proper number and sequence set. In
@@ -91,9 +86,6 @@ func CalculateGas(queryFunc func(string, common.HexBytes) ([]byte, error), cdc *
 }
 
 func adjustGasEstimate(estimate int64, adjustment float64) int64 {
-	if adjustment == 0 {
-		adjustment = DefaultGasAdjustment
-	}
 	return int64(adjustment * float64(estimate))
 }