Fix Checkstyle violation for imports order

Author: artembilan

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/listener/MessageListenerContainerMultipleQueueIntegrationTests.java

@@ -16,6 +16,8 @@
 
 package org.springframework.amqp.rabbit.listener;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -34,8 +36,6 @@
 import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
 import org.springframework.amqp.support.converter.SimpleMessageConverter;
 
-import static org.assertj.core.api.Assertions.assertThat;
-
 /**
  * @author Mark Fisher
  * @author Gunnar Hillert