Fixes #55: stop() connector to unbind socket

The `Tomcat.start()` has to happen to initialize the `ServletContext`
but we can immediately stop the connector and then restart it when
the context is finished refreshing. Seems to make curl fail quickly
if an app is slow to start.

spring-boot-samples/spring-boot-sample-tomcat/src/main/java/org/springframework/boot/sample/tomcat/web/SampleController.java

@@ -27,7 +27,7 @@ public class SampleController {
 
 	@Autowired
 	private HelloWorldService helloWorldService;
-
+	
 	@RequestMapping("/")
 	@ResponseBody
 	public String helloWorld() {