HADOOP-19073 WASB: Fix connection leak in FolderRenamePending (apache#6534)

Contributed by xuyu

Author: xuzifu666

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

@@ -160,9 +160,12 @@ public FolderRenamePending(Path redoFile, NativeAzureFileSystem fs)
 
       // open redo file
       Path f = redoFile;
-      FSDataInputStream input = fs.open(f);
-      byte[] bytes = new byte[MAX_RENAME_PENDING_FILE_SIZE];
-      int l = input.read(bytes);
+      int l;
+      byte[] bytes;
+      try (FSDataInputStream input = fs.open(f)) {
+        bytes = new byte[MAX_RENAME_PENDING_FILE_SIZE];
+        l = input.read(bytes);
+      }
       if (l <= 0) {
         // Jira HADOOP-12678 -Handle empty rename pending metadata file during
         // atomic rename in redo path. If during renamepending file is created