HDDS-1417. After successfully importing a container, datanode should delete the container tar.gz file from working directory. (#721)

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/replication/DownloadAndImportReplicator.java

@@ -95,13 +95,12 @@ public void importContainer(long containerID, Path tarFilePath) {
       LOG.error(
           "Can't import the downloaded container data id=" + containerID,
           e);
+    } finally {
       try {
         Files.delete(tarFilePath);
       } catch (Exception ex) {
-        LOG.error(
-            "Container import is failed and the downloaded file can't be "
-                + "deleted: "
-                + tarFilePath.toAbsolutePath().toString());
+        LOG.error("Got exception while deleting downloaded container file: "
+            + tarFilePath.toAbsolutePath().toString(), ex);
       }
     }
   }