Use legal java.util.logging levels in logging.properties

spring-boot/src/main/resources/org/springframework/boot/logging/java/logging.properties

@@ -11,8 +11,8 @@ java.util.logging.FileHandler.count = 10
 java.util.logging.ConsoleHandler.formatter = org.springframework.boot.logging.java.SimpleFormatter
 java.util.logging.ConsoleHandler.level = ALL
 
-org.hibernate.validator.internal.util.Version.level = WARN
-org.apache.coyote.http11.Http11NioProtocol.level = WARN
-org.crsh.plugin.level = WARN
-org.apache.tomcat.util.net.NioSelectorPool.level = WARN
-org.apache.catalina.startup.DigesterFactory.level = ERROR
+org.hibernate.validator.internal.util.Version.level = WARNING
+org.apache.coyote.http11.Http11NioProtocol.level = WARNING
+org.crsh.plugin.level = WARNING
+org.apache.tomcat.util.net.NioSelectorPool.level = WARNING
+org.apache.catalina.startup.DigesterFactory.level = SEVERE