Description of problem:

I tried using --display-name in cinder list and output is empty. 

example, I have several volumes: 
[root@opens-vdsb ~(keystone_admin)]# cinder list
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
|                  ID                  |   Status  | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| 3a888ac1-395a-4082-973e-139be9de97d9 | available |     bla1     |  10  |     bla     |  false   |             |
| 5fb0c74a-9540-4793-b386-d45ab5e4765a | available |    blaaa     |  11  |    dafna    |  false   |             |
| fb596f0d-30ff-4f74-b68e-41d14b791d9b | available |     bla      |  10  |    dafna    |  false   |             |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+

if I use:

cinder list --display-name bla we get the specific volume called bla: 

[root@opens-vdsb ~(keystone_admin)]# cinder list --display-name bla
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
|                  ID                  |   Status  | Display Name | Size | Volume Type | Bootable | Attached to |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+
| fb596f0d-30ff-4f74-b68e-41d14b791d9b | available |     bla      |  10  |    dafna    |  false   |             |
+--------------------------------------+-----------+--------------+------+-------------+----------+-------------+ 

but if I run cinder list --display-name bla* we do not get an output. 

Version-Release number of selected component (if applicable):

openstack-cinder-2013.1.2-3.el6ost.noarch

How reproducible:

100%

Steps to Reproduce:
1. create several volumes
2. run 'cinder list --display-name' with wild card
3.

Actual results:

we do not get any output. 

Expected results:

we should be able to use a wild card since its a basic search in linux. 

Additional info: