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/test/java/sample/jetty/ssl/SampleJettySslApplicationTests.java

@@ -19,14 +19,13 @@ package sample.jetty.ssl;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;
-import org.springframework.boot.test.web.client.TestRestTemplate.HttpClientOption;
-import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.boot.web.server.AbstractConfigurableWebServerFactory;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
-import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.junit4.SpringRunner;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -38,19 +37,22 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
-@DirtiesContext
 public class SampleJettySslApplicationTests {
 
-	@LocalServerPort
-	private int port;
+	@Autowired
+	private TestRestTemplate restTemplate;
+	@Autowired
+	private AbstractConfigurableWebServerFactory webServerFactory;
+
+	@Test
+	public void testSsl() {
+		assertThat(this.webServerFactory.getSsl().isEnabled()).isTrue();
+	}
 
 	@Test
 	public void testHome() throws Exception {
-		TestRestTemplate testRestTemplate = new TestRestTemplate(HttpClientOption.SSL);
-		ResponseEntity<String> entity = testRestTemplate
-				.getForEntity("https://localhost:" + this.port, String.class);
+		ResponseEntity<String> entity = this.restTemplate.getForEntity("/", String.class);
 		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
 		assertThat(entity.getBody()).isEqualTo("Hello World");
 	}
-
 }