Output columns not working for lists of Releases

[gronke]

Output column names -o are ignored when combined with the -r (list releases) flag.

Current Result

$ ioc list -r -o full_name,dataset.name
+--------------+
|  FULL_NAME   |
+==============+
| 12.0-RELEASE |
+--------------+

Expected Result

$ ioc list -r -o full_name,dataset
+--------------+---------------------------------+
|  FULL_NAME   |  DATASET.NAME                   |
+==============+=================================+
| 12.0-RELEASE | zroot/ioc/releases/12.0-RELEASE |
+--------------+---------------------------------+