Properly format 'attached to' column list when listing volumes

Previously, no data was being returned for the 'attached to' field
when listing volumes. Dig into the the returned array to format
the column.

Change-Id: Iebd79e5ddcb4a335703d9b2675aa7128995de918
Closes-Bug: #1404931
Revert some docs changes from multi-delete

The headers in the doc files are the commands, not a description.

I missed thiese in the original reviews:
https://review.openstack.org/140567
https://review.openstack.org/140581

Change-Id: Iae2631f6b485e8c568ff305e5992c193f80ebe71
Allow service description to be set for KS V3

Change-Id: Ibf84882c9a9f408268c225190436fc1a534e1017
Closes-Bug: #1404997
Fix a few issues with 'usage list'

* Added number of servers column, was missing
* Added a new line character after the initial usage message

Change-Id: I6c4e5bda6ba9ceafa92ecf13987c56d0bbe99961
Add usage show command

Should show basic usage by project id, if not specified then
use the project id the user is authN'ing with.

Change-Id: I0284a5efd84075b18e1a7117cc9f8f7fecf16274
Closes-Bug: #1400796
Merge "Revert some docs changes from multi-delete"
Merge "Allow service description to be set for KS V3"
Merge "Properly format 'attached to' column list when listing volumes"
Command object docs: container, object

Change-Id: Ie3df543a28cbee0cc809310a05f431c97b2c7e70
Merge "Command object docs: container, object"
Merge "Fix a few issues with 'usage list'"
Merge "Add usage show command"