Remove remapping of Thymeleaf's logging as it is no longer necessary

Thymeleaf 3.0 no longer logs its initialization information at INFO
level so we no longer need to remap its INFO output to DEBUG.

Closes gh-7657

spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java

 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -108,7 +108,6 @@ class DefaultLogbackConfiguration {
 		config.logger("org.hibernate.validator.internal.util.Version", Level.WARN);
 		config.logger("org.springframework.boot.actuate.endpoint.jmx", null, false,
 				debugRemapAppender);
-		config.logger("org.thymeleaf", null, false, debugRemapAppender);
 	}
 
 	private Appender<ILoggingEvent> consoleAppender(LogbackConfigurator config) {

spring-boot/src/main/resources/org/springframework/boot/logging/log4j2/log4j2-file.xml

@@ -29,7 +29,6 @@
 		<Logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="error" />
 		<Logger name="org.hibernate.validator.internal.util.Version" level="warn" />
 		<logger name="org.springframework.boot.actuate.endpoint.jmx" level="warn"/>
-		<logger name="org.thymeleaf" level="warn"/>
 		<Root level="info">
 			<AppenderRef ref="Console" />
 			<AppenderRef ref="File" />

spring-boot/src/main/resources/org/springframework/boot/logging/log4j2/log4j2.xml

@@ -21,7 +21,6 @@
 		<Logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="error" />
 		<Logger name="org.hibernate.validator.internal.util.Version" level="warn" />
 		<logger name="org.springframework.boot.actuate.endpoint.jmx" level="warn"/>
-		<logger name="org.thymeleaf" level="warn"/>
 		<Root level="info">
 			<AppenderRef ref="Console" />
 		</Root>

spring-boot/src/main/resources/org/springframework/boot/logging/logback/defaults.xml

@@ -26,7 +26,4 @@ initialization performed by Boot
 	<logger name="org.springframework.boot.actuate.endpoint.jmx" additivity="false">
 		<appender-ref ref="DEBUG_LEVEL_REMAPPER"/>
 	</logger>
-	<logger name="org.thymeleaf" additivity="false">
-		<appender-ref ref="DEBUG_LEVEL_REMAPPER"/>
-	</logger>
 </included>