谷歌计算引擎的 gcutil 工具在 list 子命令中没有显示任何图像/内核：
$ gcutil listimages --project <project_name>
+------+-------------+---------------+--------+
| name | description | creation-time | kernel |
+------+-------------+---------------+--------+
+------+-------------+---------------+--------+
虽然如果我们在配置实例时不指定图像，它会提供一组图像选项：
$ gcutil addinstance cj-test-001
1: projects/google/global/images/centos-6-2-v20120326
2: projects/google/global/images/centos-6-2-v20120503
3: projects/google/global/images/centos-6-2-v20120611
4: projects/google/global/images/centos-6-2-v20120621
...
22: projects/google/global/images/ubuntu-12-04-v20120611
23: projects/google/global/images/ubuntu-12-04-v20120621
24: projects/google/global/images/ubuntu-12-04-v20120912
如何解决通过 gcutil 列出图像的问题？