Update config-ref with keystone_autoken options

The auth_token middleware options were not tracked yet. This patch adds
the mapping information, generates the tables and include them in the
config-reference.

This patch also moves the api_rate_limit nova option in the api section.

Closes-Bug: #1254568
Change-Id: I0e34cc8e0a56336118aa933e4018c38c9dcacf9b
Use the same cirros image ID everywhere

Update the ID of the cirros image in code examples for consistency.

Also fix the image name where it wasn't updated (0.3.1 -> 0.3.2).

Change-Id: I254cffb43652e0ed706cfe31c90a7148780a8630
Merge "Update config-ref with keystone_autoken options"