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 "Fix a few issues with 'usage list'"
Merge "Add usage show command"