Add logging.level to application.properties

E.g.

logging.level.org.springframework: DEBUG
logging.level.org.hibernate: WARN

Fixed gh-788

spring-boot-samples/spring-boot-sample-web-method-security/src/main/resources/application.properties

@@ -1 +1,2 @@
 spring.thymeleaf.cache: false
+logging.level.org.springframework.security: INFO

spring-boot-samples/spring-boot-sample-web-method-security/src/main/resources/logback.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<configuration>
-	<include resource="org/springframework/boot/logging/logback/base.xml"/>
-	<!-- logger name="org.springframework.boot" level="DEBUG"/-->
-	<logger name="org.springframework.security" level="DEBUG"/>
-</configuration>