Add basic integration test to samples

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample/pom.xml

@@ -60,6 +60,11 @@
 			<groupId>org.projectlombok</groupId>
 			<artifactId>lombok</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 
 </project>