SEC-1604: Change log level to debug for "Validated configuration attributes" message.

core/src/main/java/org/springframework/security/access/intercept/AbstractSecurityInterceptor.java

@@ -153,7 +153,7 @@ public abstract class AbstractSecurityInterceptor implements InitializingBean, A
                 throw new IllegalArgumentException("Unsupported configuration attributes: " + unsupportedAttrs);
             }
 
-            logger.info("Validated configuration attributes");
+            logger.debug("Validated configuration attributes");
         }
     }