Adding swift temp url support

[OpenStack Infra]

https://review.openstack.org/81391

Dear documentation bug triager. This bug was created here because we did not know how to map the project name "openstack/ironic" to a launchpad project name. This indicates that the notify_impact config needs tweaks. You can ask the OpenStack infra team (#openstack-infra on freenode) for help if you need to.

commit e2eaaaf1b50a2088b9f9205cb31a0499a6a7d1f5
Author: Josh Gachnang <email address hidden>
Date: Wed Mar 19 16:47:38 2014 -0700

    Adding swift temp url support

    This patch will allow properly configured Glance servers to return a temporary
    URL for an object hosted on Swift. It will require Glance to use Swift
    as its backend. A temporary URL allow a deploy driver to download an image
    from Glance without requiring an auth_token, which gives access more than
    just Glance. This requires a set of config options: the Glance endpoint URL,
    a shared secret temporary key, and the account configured in Glance to talk
    to Swift with, which owns the container images are stored in.

    A later patch will explore using the direct_url in Glance to simplify the
    config options.

    We/I need to add a note in the docs about Swift being a possible dependency
    for Ironic deploys using IPA, along with how to set the Temp URL key.

    Swift performance concerns will be addressed in this blueprint:
    https://blueprints.launchpad.net/ironic/+spec/improve-swift-agent-downloads

    SecurityImpact
    DocImpact

    Partial Implements: blueprint swift-temp-urls
    Change-Id: I10e4784eee63e8edc9ba30a9c5004a08aa3a6d8e

[Tom Fifield (fifieldt)]

This is for ironic.