Swift auth_token example should configure cache=swift.cache

[Chmouel Boudjnah]

auth_token for Swift have to use the swift cache instead of its own cache or things willl go badly.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24009

[Tom Fifield (fifieldt)]

 https://review.openstack.org/24009

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/24009
Committed: http://github.com/openstack/openstack-manuals/commit/b779171cac2add5c0df17a53a57eabffedd23367
Submitter: Jenkins
Branch: master

commit b779171cac2add5c0df17a53a57eabffedd23367
Author: Tom Fifield <email address hidden>
Date: Sun Mar 10 13:42:19 2013 +1100

    Use correct cache setting with swift authtoken

    fixes bug 1131433

    As noted in the bug report, bad things happen if
    the wrong cache value is used with the authtoken
    filter.

    See associated update in swift repo:
    https://review.openstack.org/#/c/22615

    Change-Id: I979a9d7bce12867b3ec2dc303c4df74678ee9798