HADOOP-17163. ABFS: Adding debug log for rename failures

- Contributed by Bilahari T H

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/AzureBlobFileSystem.java

@@ -323,6 +323,7 @@ public class AzureBlobFileSystem extends FileSystem {
       abfsStore.rename(qualifiedSrcPath, qualifiedDstPath);
       return true;
     } catch(AzureBlobFileSystemException ex) {
+      LOG.debug("Rename operation failed. ", ex);
       checkException(
               src,
               ex,