fixed #56 for JUnit5 integration

Author: kimmking

apollo-mockserver/src/main/java/com/ctrip/framework/apollo/mockserver/ApolloTestingServer.java

@@ -44,7 +44,7 @@
 
 public class ApolloTestingServer implements AutoCloseable {
 
-    private static final Logger logger = LoggerFactory.getLogger(EmbeddedApollo.class);
+    private static final Logger logger = LoggerFactory.getLogger(ApolloTestingServer.class);
     private static final Type notificationType = new TypeToken<List<ApolloConfigNotification>>() {
     }.getType();