Description of problem:

I ran glance image-list --sort-key name --sort-key size 
and the command ran but the list only comes back with the last field sorted (i.e list is sorted by size) 

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

openstack-glance-2013.1.3-1.el6ost.noarch

How reproducible:

100%

Steps to Reproduce:
1. create several images 
2. run: glance image-list --sort-key name --sort-key size
3.

Actual results:

the list is only sorted by size 

Expected results:

if we can currently only sort by one field do not allow multiple --sort-key to run and exit. 

Additional info:


[root@opens-vdsb ~(keystone_admin)]# glance image-list --sort-key name --sort-key size
+--------------------------------------+------------------+-------------+------------------+------------+--------+
| ID                                   | Name             | Disk Format | Container Format | Size       | Status |
+--------------------------------------+------------------+-------------+------------------+------------+--------+
| 0c4bc71a-4fa0-4585-9af1-e49b06d57082 | just_copy        | qcow2       | bare             | 1          | active |
| 55d45384-6b4b-40c6-b399-639b03c06c3b | human            | qcow2       | bare             | 1          | active |
| 23bf4915-9f83-4eb5-a7c2-702de4d825e7 | image_size_file  | qcow2       | bare             | 1          | active |
| 208bf4d0-f760-4212-8cf5-dd3ab0015a7d | disk_size        | qcow2       | bare             | 1440612352 | active |
| 43421785-6fb0-4ef2-8068-7993072a7735 | file             | qcow2       | bare             | 1440612352 | active |
| fbf238ee-8396-4da2-961b-613b7c4ed9ec | rhevm_image      | qcow2       | bare             | 1440612352 | active |
| dc79349e-de25-4ec5-8b12-5a6145270c47 | test             | qcow2       | bare             | 1974140928 | active |
| 05c9b5e2-3082-4ad3-8d03-faf74b61234c | rhel64           | qcow2       | bare             | 1974140928 | active |
| ec358c7a-6579-4cda-93a5-8e409fb6e7d9 | tenant           | qcow2       | bare             | 1974140928 | active |
| 1433f462-0079-49dc-b6be-a7927c12be77 | check            | qcow2       | bare             | 1974140928 | active |
| 9df487b3-6a71-48ff-a012-668324aae01f | not_public       | qcow2       | bare             | 1974140928 | active |
| e2e2fa1a-55b4-426a-a05b-9d9e70ffed72 | no_del           | qcow2       | bare             | 1974140928 | active |
| 6e860237-2110-428c-870a-a81b1c7df258 | not_public_dafna | qcow2       | bare             | 1974140928 | active |
| 723dfae6-fd58-440a-9f71-1f1da82e3229 | not_public_dafna | qcow2       | bare             | 1974140928 | active |
| df77a225-7ccf-4b03-a5fc-31a8c5e83e04 | dron             |             |                  | 1974140928 | queued |
| 14b12673-5678-4494-9aa0-b54d15020eec | downloaded_image | qcow2       | bare             | 1974140928 | active |
| c203f297-fe71-40d7-a5b4-f3274347fa14 | human            | qcow2       | bare             | 1974140928 | active |
| b06050f8-90f1-4a81-aaa4-4653a15e1dc2 | human            | qcow2       | bare             | 1974140928 | active |
| e0800016-fe8c-43f3-b273-2ec7f1588c42 | human            | qcow2       | bare             | 1974140928 | active |
+--------------------------------------+------------------+-------------+------------------+------------+--------+