Comment 2 for bug 1201283

Reviewed: https://review.openstack.org/37069
Committed: http://github.com/openstack/nova/commit/7e8fa8f3e6acac0e510cd1fc5af591f9a321d03a
Submitter: Jenkins
Branch: master

commit 7e8fa8f3e6acac0e510cd1fc5af591f9a321d03a
Author: Kieran Spear <email address hidden>
Date: Mon Jul 15 22:00:19 2013 +1000

    Fix filtering aggregate metadata by key

    Filtering by metadata key has no effect in the following two functions:

        aggregate_metadata_get_by_host
        aggregate_host_get_by_metadata_key

    Rely on the explicit join instead of joinedload to load the _metadata
    relationship in these functions (indicated by the contains_eager
    option), so that filtering by key still applies when the metadata is
    collected.

    Fixes bug 1201283.

    Change-Id: I3e44b5db8d67787bfa14f0e57d30a02a271a8833