Case-sensitivity for volume types created by the openstack client

[weisongf]

OpenStack version : Rocky
python-openstackclient 3.14.2-0ubuntu1

The operation process is as follows：

root@mgt01:~# openstack volume type show TEST
No volumetype with a name or ID of 'TEST' exists.

root@mgt01:~# openstack volume type create TEST
Volume Type TEST already exists. (HTTP 409) (Request-ID: req-b557d2a3-ca0e-4af0-ac6c-7544641617bd)

root@mgt01:~# openstack volume type list
+--------------------------------------+-------------+-----------+
| ID | Name | Is Public |
+--------------------------------------+-------------+-----------+
| 773e831b-3ae9-46f6-a2d2-4f198f9c0ff8 | test | True |
| 6b766655-d4fb-47f1-aeff-daf8618b3b0a | rbd2 | True |
| 4dcdeea7-c234-486c-b31e-5e4bfa9340fd | multiattach | True |
| 1bed3931-2653-4368-9656-a7d6594fa1b0 | rbd1 | True |
+--------------------------------------+-------------+-----------+