privilege: fix privilege problem after upgrade (#14177)

[imtbkcat]

What problem does this PR solve?

cherry-pick (#14177)

[imtbkcat]

manual test in this way:

create user with all privilege in v3.0.5:

mysql> create user t1;
Query OK, 0 rows affected (0.00 sec)

mysql> create user t2;
Query OK, 0 rows affected (0.01 sec)

mysql> grant all on *.* to t1;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from mysql.user where user='t1'\G;
*************************** 1. row ***************************
                 Host: %
                 User: t1
             Password:
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: Y
          Create_priv: Y
            Drop_priv: Y
         Process_priv: Y
           Grant_priv: Y
      References_priv: Y
           Alter_priv: Y
         Show_db_priv: Y
           Super_priv: Y
Create_tmp_table_priv: N
     Lock_tables_priv: N
         Execute_priv: Y
     Create_view_priv: Y
       Show_view_priv: Y
  Create_routine_priv: N
   Alter_routine_priv: N
           Index_priv: Y
     Create_user_priv: Y
           Event_priv: N
         Trigger_priv: Y
     Create_role_priv: Y
       Drop_role_priv: Y
       Account_locked: N
1 row in set (0.00 sec)

upgrade to latest version:

mysql> show grants for t1;
+-----------------------------------------------------------+
| Grants for t1@%                                           |
+-----------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 't1'@'%' WITH GRANT OPTION |
+-----------------------------------------------------------+
1 row in set (0.00 sec)

mysql> show grants for t2;
+--------------------------------+
| Grants for t2@%                |
+--------------------------------+
| GRANT USAGE ON *.* TO 't2'@'%' |
+--------------------------------+
1 row in set (0.00 sec)

mysql> select * from mysql.user where user='t1'\G;
*************************** 1. row ***************************
                 Host: %
                 User: t1
             Password:
          Select_priv: Y
          Insert_priv: Y
          Update_priv: Y
          Delete_priv: Y
          Create_priv: Y
            Drop_priv: Y
         Process_priv: Y
           Grant_priv: Y
      References_priv: Y
           Alter_priv: Y
         Show_db_priv: Y
           Super_priv: Y
Create_tmp_table_priv: Y
     Lock_tables_priv: Y
         Execute_priv: Y
     Create_view_priv: Y
       Show_view_priv: Y
  Create_routine_priv: Y
   Alter_routine_priv: Y
           Index_priv: Y
     Create_user_priv: Y
           Event_priv: Y
         Trigger_priv: Y
     Create_role_priv: Y
       Drop_role_priv: Y
       Account_locked: N
        Shutdown_priv: Y
1 row in set (0.01 sec)

[lysu]

LGTM

[imtbkcat]

/run-all-tests

[jackysp]

LGTM

[jackysp]

/merge

[sre-bot]

Your auto merge job has been accepted, waiting for 14073

[sre-bot]

/run-all-tests