Create a report based on Boot's autoconfiguration decisions

- Gather autoconfiguration conditional decisiions (true and false)
- Provide an actuator endpoint as one means to read the report
- Define @EnableAutConfigurationReport annotation to turn this feature on
- Tidy up autoconfig report a bit and log it if --debug=true

spring-boot-samples/spring-boot-sample-secure/src/main/resources/application.properties

@@ -1 +1,2 @@
-spring.thymeleaf.cache: false
+spring.thymeleaf.cache: false
+debug: true