Improve RabbitMQ support in CLI

This commit deprecates the proprietary EnableRabbitMessaging annotation
in favour of the standard @EnableRabbit introduced as of Spring Rabbit
1.4.

Fixes gh-1494

spring-boot-cli/samples/rabbit.groovy

@@ -4,7 +4,7 @@ import java.util.concurrent.CountDownLatch
 
 @Log
 @Configuration
-@EnableRabbitMessaging
+@EnableRabbit
 class RabbitExample implements CommandLineRunner {
 
 	private CountDownLatch latch = new CountDownLatch(1)
@@ -12,52 +12,21 @@ class RabbitExample implements CommandLineRunner {
 	@Autowired
 	RabbitTemplate rabbitTemplate
 
-	private String queueName = "spring-boot"
-
-	@Bean
-	Queue queue() {
-		new Queue(queueName, false)
-	}
-
-	@Bean
-	TopicExchange exchange() {
-		new TopicExchange("spring-boot-exchange")
-	}
-
-	/**
-	 * The queue and topic exchange cannot be inlined inside this method and have
-	 * dynamic creation with Spring AMQP work properly.
-	 */
-	@Bean
-	Binding binding(Queue queue, TopicExchange exchange) {
-		BindingBuilder
-				.bind(queue)
-				.to(exchange)
-				.with("spring-boot")
-	}
-
-	@Bean
-	SimpleMessageListenerContainer container(CachingConnectionFactory connectionFactory) {
-		return new SimpleMessageListenerContainer(
-		connectionFactory: connectionFactory,
-		queueNames: [queueName],
-		messageListener: new MessageListenerAdapter(new Receiver(latch:latch), "receive")
-		)
-	}
-
 	void run(String... args) {
 		log.info "Sending RabbitMQ message..."
-		rabbitTemplate.convertAndSend(queueName, "Greetings from Spring Boot via RabbitMQ")
+		rabbitTemplate.convertAndSend("spring-boot", "Greetings from Spring Boot via RabbitMQ")
 		latch.await()
 	}
-}
-
-@Log
-class Receiver {
-	CountDownLatch latch
 
+	@RabbitListener(queues = 'spring-boot')
 	def receive(String message) {
 		log.info "Received ${message}"
 		latch.countDown()
 	}
-}
+
+	@Bean
+	Queue queue() {
+		new Queue("spring-boot", false)
+	}
+
+}