Samples cleanup

- Modifying dependencies to starter-web with tomcat exclusion plus
  alternative servlet container instead of manual dependency on
  spring-webmvc as it is the preferrable way to use alternative servlet
  container
- Previously RestTemplate with ssl was configured manually in tests - now
  it rellies on autoconfiguration - changed this for multi-connector test
  and added test to ensure that ssl autoconfiguration is working
- Most samples with alterntative servlet containers used some kind of
  service reading property and returning default since it wasn't
  configured - removed it, since it is not specific to using alternative
  servlet containers.

See gh-10548

spring-boot-samples/spring-boot-sample-jetty-ssl/src/main/java/sample/jetty/ssl/service/HelloWorldService.java

@@ -1,32 +0,0 @@
-/*
- * Copyright 2012-2015 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package sample.jetty.ssl.service;
-
-import org.springframework.beans.factory.annotation.Value;
-import org.springframework.stereotype.Component;
-
-@Component
-public class HelloWorldService {
-
-	@Value("${name:World}")
-	private String name;
-
-	public String getHelloMessage() {
-		return "Hello " + this.name;
-	}
-
-}

spring-boot-samples/spring-boot-sample-jetty-ssl/src/main/java/sample/jetty/ssl/web/SampleController.java

@@ -16,23 +16,13 @@
 
 package sample.jetty.ssl.web;
 
-import sample.jetty.ssl.service.HelloWorldService;
-
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
-import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.RestController;
 
-@Controller
+@RestController
 public class SampleController {
-
-	@Autowired
-	private HelloWorldService helloWorldService;
-
 	@GetMapping("/")
-	@ResponseBody
 	public String helloWorld() {
-		return this.helloWorldService.getHelloMessage();
+		return "Hello World";
 	}
-
 }