Fixed a lot of checkstyle warnings'

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample/src/main/java/sample/SampleBackground.java

@@ -30,10 +30,12 @@ import org.springframework.stereotype.Component;
  */
 @Component
 public class SampleBackground {
+
 	private static final Log log = LogFactory.getLog(SampleBackground.class);
 
 	@Autowired
 	private Tracer tracer;
+
 	private Random random = new Random();
 
 	@Async

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample/src/main/java/sample/SampleController.java

@@ -35,16 +35,21 @@ import org.springframework.web.client.RestTemplate;
  */
 @RestController
 public class SampleController
-		implements ApplicationListener<ServletWebServerInitializedEvent > {
+		implements ApplicationListener<ServletWebServerInitializedEvent> {
+
 	private static final Log log = LogFactory.getLog(SampleController.class);
+
 	@Autowired
 	private RestTemplate restTemplate;
+
 	@Autowired
 	private Tracer tracer;
+
 	@Autowired
 	private SampleBackground controller;
 
 	private final Random random = new Random();
+
 	private int port;
 
 	@RequestMapping("/")
@@ -121,4 +126,5 @@ public class SampleController
 	public void onApplicationEvent(ServletWebServerInitializedEvent event) {
 		this.port = event.getSource().getPort();
 	}
+
 }