Add new command 'rsd storage list' to allow user to list all storage
services brief info like below shows.
$ openstack rsd storage list
+----------+-----------------+-----------------------------+
| Identity | Name | Description |
+----------+-----------------+-----------------------------+
| 1 | Storage Service | Storage Service for Testing |
+----------+-----------------+-----------------------------+
Change-Id: Id54e630881de4c79f731ca93e6bf7a3c18fe6589
c09c76951e