MDEV-36010 - fix myrocks_hotbackup for python3

python collections.OrderedDict removed iteritems

see https://peps.python.org/pep-0469/

myrocks_hotbackup --move_back --datadir=$DATADIR --rocksdb_datadir="$DATADIR/#rocksdb" --rocksdb_waldir=$DATADIR --backup_dir=/tmp/myrocks.bak
2024-11-13 14:00:35.415 ERROR Directory /mnt/data/i18n/mariadb/data has file or directory #rocksdb!

Author: i18nsite

storage/rocksdb/myrocks_hotbackup.py

@@ -268,7 +268,7 @@ def do_backup_until(self, time_limit):
     start_time= time.time()
     last_progress_time= start_time
     progress_size= 0
-    for fname, size in self.target_sst.iteritems():
+    for fname, size in self.target_sst.items():
       self.do_backup_sst(fname, size)
       progress_size= progress_size + size
       elapsed_seconds = time.time() - start_time
@@ -319,11 +319,13 @@ def connect(user, password, port, socket=None):
     if socket:
       dbh = MySQLdb.Connect(user=user,
                             passwd=password,
+                            charset='utf8',
                             unix_socket=socket)
     else:
       dbh = MySQLdb.Connect(user=user,
                             passwd=password,
                             port=port,
+                            charset='utf8',
                             host="127.0.0.1")
     return dbh
 
@@ -645,8 +647,8 @@ def move_back():
     print_move_back_usage()
     sys.exit()
   create_moveback_dir(opts.datadir)
-  create_moveback_dir(opts.rocksdb_datadir)
   create_moveback_dir(opts.rocksdb_waldir)
+  create_moveback_dir(opts.rocksdb_datadir)
 
   os.chdir(opts.backupdir)
   for f in os.listdir(opts.backupdir):