Fix confirm resize policy issue

[Rick Harris]

https://paste.slicehost.com/show/5923/

Two issues appear to be at play here:

1. compute_api.confirm_resize takes an instance object not, not a UUID

2. nova/common/policy relies on context.roles for determining admin-ness and not is_admin. This means we need to set 'admin' role if is_admin=True.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/3886

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/3886
Committed: http://github.com/openstack/nova/commit/f33de5c9ad6217a9daa1bafd8f1d3e71f618dda2
Submitter: Jenkins
Branch: master

commit f33de5c9ad6217a9daa1bafd8f1d3e71f618dda2
Author: Rick Harris <email address hidden>
Date: Wed Feb 8 06:52:14 2012 +0000

    Fix confirm_resize policy handling

    Fixes bug 928649

    markwash:
     - fixed pep8 violation

    Change-Id: Ie1c3136256dac0e350e430ac7c69eba4cb98b158