Re-add bean conditions for cloud config

- Re-add `@ConditionalOnMissingBean` to connection factory beans in cloud configurations
 - This is needed at least for CF case where auto-reconfiguration sets up connection factory beans

spring-cloud-stream-binders/spring-cloud-stream-binder-rabbit/src/main/java/org/springframework/cloud/stream/binder/rabbit/config/RabbitServiceAutoConfiguration.java

@@ -53,6 +53,7 @@ public class RabbitServiceAutoConfiguration {
 		}
 
 		@Bean
+		@ConditionalOnMissingBean(ConnectionFactory.class)
 		ConnectionFactory rabbitConnectionFactory(Cloud cloud) {
 			return cloud.getSingletonServiceConnector(ConnectionFactory.class, null);
 		}

spring-cloud-stream-binders/spring-cloud-stream-binder-redis/src/main/java/org/springframework/cloud/stream/binder/redis/config/RedisServiceAutoConfiguration.java

@@ -52,6 +52,7 @@ public class RedisServiceAutoConfiguration {
 			return new CloudFactory().getCloud();
 		}
 		@Bean
+		@ConditionalOnMissingBean(RedisConnectionFactory.class)
 		RedisConnectionFactory redisConnectionFactory(Cloud cloud) {
 			return cloud.getSingletonServiceConnector(RedisConnectionFactory.class, null);
 		}