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/java/org/springframework/boot/sample/ops/ui/SampleSecureApplication.java

@@ -20,6 +20,7 @@ import java.util.Date;
 import java.util.Map;
 
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.report.EnableAutoConfigurationReport;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
@@ -33,6 +34,7 @@ import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 
 @EnableAutoConfiguration
+@EnableAutoConfigurationReport
 @ComponentScan
 @Controller
 public class SampleSecureApplication extends WebMvcConfigurerAdapter {