Merge pull request #731 from lasanthaDLPDS/master

Fixing minor error in device type API implementation

components/extensions/mb-extensions/org.wso2.carbon.andes.extensions.device.mgt.mqtt.authorization/src/main/java/org/wso2/carbon/andes/extensions/device/mgt/mqtt/authorization/client/dto/DeviceIdentifier.java

@@ -39,7 +39,7 @@ public class DeviceIdentifier implements Serializable{
     }
 
     public void setType(String type) {
-        this.type = type.toLowerCase();
+        this.type = type;
     }
     public String getId() {
         return id;