Closing and restarting WireMock stub after and before each test (#707)

fixes gh-665

samples/wiremock-undertow/src/test/java/com/example/WiremockImportApplicationTests.java

@@ -18,7 +18,6 @@ import org.springframework.test.context.junit4.SpringRunner;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(properties="app.baseUrl=http://localhost:7070", webEnvironment=WebEnvironment.NONE)
-@DirtiesContext
 @AutoConfigureWireMock(port = 7070)
 public class WiremockImportApplicationTests {
 

samples/wiremock-undertow/src/test/java/com/example/WiremockMockServerApplicationTests.java

@@ -15,7 +15,6 @@ import org.springframework.web.client.RestTemplate;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(webEnvironment=WebEnvironment.NONE)
-@DirtiesContext
 public class WiremockMockServerApplicationTests {
 
 	@Autowired

samples/wiremock-undertow/src/test/java/com/example/WiremockServerApplicationTests.java

@@ -20,7 +20,6 @@ import com.github.tomakehurst.wiremock.junit.WireMockClassRule;
 
 @RunWith(SpringRunner.class)
 @SpringBootTest(properties="app.baseUrl=http://localhost:7071", webEnvironment=WebEnvironment.NONE)
-@DirtiesContext
 public class WiremockServerApplicationTests {
 
 	@ClassRule