Fix Event Test

https://build.spring.io/browse/AMQP-MEIGHT-1247/

Previous commit added more events but the test latch wasn't adjusted to suit.

Author: garyrussell

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/listener/SimpleMessageListenerContainerIntegration2Tests.java

@@ -200,7 +200,7 @@ public void testDeleteOneQueue() throws Exception {
 		container.setFailedDeclarationRetryInterval(100);
 		final List<AmqpEvent> events = new ArrayList<>();
 		final AtomicReference<ListenerContainerConsumerFailedEvent> eventRef = new AtomicReference<>();
-		final CountDownLatch eventLatch = new CountDownLatch(4);
+		final CountDownLatch eventLatch = new CountDownLatch(8);
 		container.setApplicationEventPublisher(new ApplicationEventPublisher() {
 
 			@Override