Comment 6 for bug 1196893

Reviewed: https://review.openstack.org/36651
Committed: http://github.com/openstack/nova/commit/40986bc17c5fccac74df5edad13bb70ef16f7987
Submitter: Jenkins
Branch: master

commit 40986bc17c5fccac74df5edad13bb70ef16f7987
Author: jiataotj <email address hidden>
Date: Thu Jul 11 21:04:41 2013 +0800

    Fix multi availability zone issue part 1

    Current aggregate APIs allow user to add multi
    AZs to a host, but Openstack support single AZ
    of a host. When booting an instance, nova uses
    the first AZ assigned to a host,even if user
    assigned multi AZs to the host and user chose
    the second AZ to boot an instance. So multi AZs
    aren't supported by current Openstack design,
    we should fix aggregate APIs to align the design
    . This patch is for limit user to add multi AZs
    using aggregate-add-host API.

    The part 2 limits user to add multi AZs using aggregate
    update and aggregate metadata update API, here is the
    link:
    I18ad1ac22c6aee298ccc75c978b85241ae1ac616

    Fixes: bug #1196893

    Change-Id: I788782a9f21ec2672551f75123753175bb268586