Only check for singleton in AutoConfigurationReportLoggingInitializer

Using containsBean() involves looking in the parent bean factory
if there is one, and that would mean that the same report woykd be used
for multiple contexts, which wouldn't make sense.

Author: Dave Syer

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/AutoConfigurationReportLoggingInitializer.java

@@ -59,7 +59,7 @@ public class AutoConfigurationReportLoggingInitializer implements
 	public void initialize(ConfigurableApplicationContext applicationContext) {
 		this.loggerBean = new AutoConfigurationReportLogger(applicationContext);
 		ConfigurableListableBeanFactory beanFactory = applicationContext.getBeanFactory();
-		if (!beanFactory.containsBean(LOGGER_BEAN)) {
+		if (!beanFactory.containsSingleton(LOGGER_BEAN)) {
 			beanFactory.registerSingleton(LOGGER_BEAN, this.loggerBean);
 		}
 	}