[fix][client] Fix Checkstyle import order in MultiTopicsConsumerEpochRaceTest

Author: ChimdumebiNebolisa

pulsar-client/src/test/java/org/apache/pulsar/client/impl/MultiTopicsConsumerEpochRaceTest.java

@@ -24,7 +24,7 @@
 import static org.mockito.Mockito.when;
 import static org.testng.Assert.assertNotEquals;
 import static org.testng.Assert.assertTrue;
-
+import io.netty.util.concurrent.DefaultThreadFactory;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
 import java.nio.ByteBuffer;
@@ -36,8 +36,6 @@
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
-
-import io.netty.util.concurrent.DefaultThreadFactory;
 import org.apache.pulsar.client.api.Consumer;
 import org.apache.pulsar.client.api.MessageListener;
 import org.apache.pulsar.client.api.Messages;