Instance logging should be able to handle uuids as well as full instance dicts

[Michael Still]

At the moment, you can only pass an instance to a logging call. You should be able to pass just the uuid as well if that's all you have at the time.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/6341

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/6341
Committed: http://github.com/openstack/nova/commit/679293467630f1a4aca2e27506db313131b51863
Submitter: Jenkins
Branch: master

commit 679293467630f1a4aca2e27506db313131b51863
Author: Michael Still <email address hidden>
Date: Sat Apr 7 17:42:32 2012 +1000

    Allow instance logging to use just a UUID.

    Sometimes all you have is an instance UUID, and its not worth
    building an instance dict just for logging. Allow callers to pass
    just the UUID if that's all they have. Resolves bug 975774.

    I have included a sample use as well.

    Change-Id: I1eb50515d837869ed7fdc5e766d8700be7da3286