checkstyle fixed

redisson/src/main/java/org/redisson/client/handler/PingConnectionHandler.java

@@ -15,22 +15,20 @@
  */
 package org.redisson.client.handler;
 
-import java.util.concurrent.TimeUnit;
-
+import io.netty.channel.ChannelHandler.Sharable;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.util.Timeout;
+import io.netty.util.TimerTask;
 import org.redisson.api.RFuture;
 import org.redisson.client.RedisClientConfig;
 import org.redisson.client.RedisConnection;
 import org.redisson.client.codec.StringCodec;
-import org.redisson.client.protocol.CommandData;
 import org.redisson.client.protocol.RedisCommands;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import io.netty.channel.ChannelHandler.Sharable;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.util.Timeout;
-import io.netty.util.TimerTask;
+import java.util.concurrent.TimeUnit;
 
 /**
  *