Comment 1 for bug 1160268

Reviewed: https://review.openstack.org/25373
Committed: http://github.com/openstack/nova/commit/0fe9beb7c0ae763c9d5bfd8598ec7e79b2fbf42c
Submitter: Jenkins
Branch: master

commit 0fe9beb7c0ae763c9d5bfd8598ec7e79b2fbf42c
Author: Guan Qiang <email address hidden>
Date: Tue Mar 26 17:47:11 2013 +0800

    Fix migrating instance to the same host.

    In current code logic, Migration to the same host is allowed which is
    meaningless.

    In the patch, a Conf flag 'allow_migrate_to_same_host' is added and set to
    false as default. When 'allow_migrate_to_same_host' is false, the current
    instance host will be added into filter property 'ignore_hosts' to avoid
    migrating instance to the same host.

    Fixes: bug #1160268

    Change-Id: I5ac0391cf468310a89fb6d8a8f5120c5654cb4ff