fix 方法报错

iot-test-tool/iot-test-mqtt/src/main/java/cc/iotkit/test/mqtt/service/Gateway.java

@@ -9,7 +9,8 @@
  */
 package cc.iotkit.test.mqtt.service;
 
-import cc.iotkit.common.Constants;
+
+import cc.iotkit.common.constant.Constants;
 import cc.iotkit.common.utils.JsonUtils;
 import cc.iotkit.test.mqtt.config.Mqtt;
 import cc.iotkit.test.mqtt.model.Request;