[#89] Initial approach to the integration tests

- Fixed the tests
- Updated surefire
- Added integration tests (for the moment ignored)
- Fixed wrong surefire setup

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-messaging/src/main/java/sample/SampleBackground.java

@@ -16,15 +16,14 @@
 
 package sample;
 
-import java.util.Random;
-
 import lombok.SneakyThrows;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.cloud.sleuth.TraceManager;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Component;
 
+import java.util.Random;
+
 /**
  * @author Spencer Gibb
  */

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-messaging/src/main/resources/logback.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <include resource="org/springframework/boot/logging/logback/base.xml"/>
+    <logger name="org.springframework.cloud.sleuth" level="DEBUG"/>
+    <root level="INFO">
+        <appender-ref ref="CONSOLE" />
+        <appender-ref ref="FILE" />
+    </root>
+</configuration>