Pass additional context info in headers to glance

[Iccha Sethi]

Glance is moving towards an optional no auth strategy. Therefore it is reliant on nova sending it the necessary information.

Related bugs:

https://bugs.launchpad.net/python-glanceclient/+bug/1200758

Related reviews:

https://review.openstack.org/#/c/36563/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/37070

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/37070
Committed: http://github.com/openstack/nova/commit/5bb1803cfd82eceec09765fb3c41e9e571364a94
Submitter: Jenkins
Branch: master

commit 5bb1803cfd82eceec09765fb3c41e9e571364a94
Author: iccha.sethi <email address hidden>
Date: Fri Jul 12 20:23:19 2013 +0000

    Add identity headers while calling glanceclient

    Glance and glanceclient have patches up for a no auth
    option in glance. In order for that to happen, nova needs to
    send in additional information in its headers to glanceclient.
    More details:
    Some deployments have everything in the same network. And
    for long running snapshots this may cause 401s because
    token expires. In these cases the reauth is not required
    cause nova has already authenticated the user.
    This patch does not convert it to no auth. It only makes
    it optional for glance users who do want to use that option.
    Related patches:
    https://review.openstack.org/#/c/37062/
    https://review.openstack.org/#/c/36563/

    Resolves bug 1200761

    Change-Id: Ife02059abbdce7920f1f408b71e9745d777fa770