Shutdown test executors in -core

- don't use `ExecutorService` as `@Bean` - spring can't stop them
- also add log adjuster for ftp test that sometimes fails

spring-integration-ftp/src/test/java/org/springframework/integration/ftp/inbound/FtpStreamingMessageSourceTests.java

@@ -26,6 +26,7 @@ import java.io.InputStream;
 import java.util.Comparator;
 
 import org.apache.commons.net.ftp.FTPFile;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -46,6 +47,7 @@ import org.springframework.integration.ftp.FtpTestSupport;
 import org.springframework.integration.ftp.session.FtpFileInfo;
 import org.springframework.integration.ftp.session.FtpRemoteFileTemplate;
 import org.springframework.integration.scheduling.PollerMetadata;
+import org.springframework.integration.test.rule.Log4j2LevelAdjuster;
 import org.springframework.integration.transformer.StreamTransformer;
 import org.springframework.messaging.Message;
 import org.springframework.scheduling.support.PeriodicTrigger;
@@ -71,6 +73,10 @@ public class FtpStreamingMessageSourceTests extends FtpTestSupport {
 	@Autowired
 	private SourcePollingChannelAdapter adapter;
 
+	@Rule
+	public Log4j2LevelAdjuster adjuster = Log4j2LevelAdjuster.debug()
+		.categories("org.springframework.integration", "org.apache.commons");
+
 	@SuppressWarnings("unchecked")
 	@Test
 	public void testAllContents() {