[FLINK-5328] [logging] Add Thread name to FileSystem disposeFileSyste…

…mCloseableRegistryForTask

Adding this to the FileSystem dispose call in order to help debugging FLINK-5328
when it occurs again. After the initial skim over the logs it looks like the
streams are closed to early for the failed task.

flink-core/src/main/java/org/apache/flink/core/fs/FileSystem.java

@@ -83,7 +83,7 @@ public static void createFileSystemCloseableRegistryForTask() {
 	public static void disposeFileSystemCloseableRegistryForTask() {
 		SafetyNetCloseableRegistry registry = REGISTRIES.get();
 		if (null != registry) {
-			LOG.info("Ensuring all FileSystem streams are closed");
+			LOG.info("Ensuring all FileSystem streams are closed for {}", Thread.currentThread().getName());
 			REGISTRIES.remove();
 			IOUtils.closeQuietly(registry);
 		}