Turn down logging in DefaultSingletonBeanRegistry

Reduce INFO level destroy logging to DEBUG

Issue: SPR-10758

Author: philwebb

spring-beans/src/main/java/org/springframework/beans/factory/support/DefaultSingletonBeanRegistry.java

@@ -448,8 +448,8 @@ public String[] getDependenciesForBean(String beanName) {
 	}
 
 	public void destroySingletons() {
-		if (logger.isInfoEnabled()) {
-			logger.info("Destroying singletons in " + this);
+		if (logger.isDebugEnabled()) {
+			logger.debug("Destroying singletons in " + this);
 		}
 		synchronized (this.singletonObjects) {
 			this.singletonsCurrentlyInDestruction = true;