Bump AWS libraries to latest

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/aws/aws-sdk-go/private/protocol/rest/payload.go

@@ -28,18 +28,27 @@ func PayloadMember(i interface{}) interface{} {
 	return nil
 }
 
-// PayloadType returns the type of a payload field member of i if there is one, or "".
+const nopayloadPayloadType = "nopayload"
+
+// PayloadType returns the type of a payload field member of i if there is one,
+// or "".
 func PayloadType(i interface{}) string {
 	v := reflect.Indirect(reflect.ValueOf(i))
 	if !v.IsValid() {
 		return ""
 	}
+
 	if field, ok := v.Type().FieldByName("_"); ok {
+		if noPayload := field.Tag.Get(nopayloadPayloadType); noPayload != "" {
+			return nopayloadPayloadType
+		}
+
 		if payloadName := field.Tag.Get("payload"); payloadName != "" {
 			if member, ok := v.Type().FieldByName(payloadName); ok {
 				return member.Tag.Get("type")
 			}
 		}
 	}
+
 	return ""
 }