add Log4j2Filter. fixed issue #1300

src/main/java/com/alibaba/druid/filter/logging/Log4j2Filter.java

@@ -21,7 +21,7 @@ import org.apache.logging.log4j.Logger;
 /**
  * @author wenshao [szujobs@hotmail.com]
  */
-public class Log4j2Filter extends LogFilter implements Log4jFilterMBean {
+public class Log4j2Filter extends LogFilter implements Log4j2FilterMBean {
 
     private Logger dataSourceLogger = LogManager.getLogger(dataSourceLoggerName);
     private Logger connectionLogger = LogManager.getLogger(connectionLoggerName);

src/main/java/com/alibaba/druid/filter/logging/Log4j2FilterMBean.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 1999-2101 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.filter.logging;
+
+public interface Log4j2FilterMBean extends LogFilterMBean {
+
+}