remove cached console auth tokens after instance migrate to other host

[Yaguang Tang]

the instance console auth tokens will become invalid after instance migrating to another server. so we'd better remove the tokens from the cache of the instance.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/43093

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/43093
Committed: http://github.com/openstack/nova/commit/2516125d5eb2aa1cea12bdacb31560a2075e1f3a
Submitter: Jenkins
Branch: master

commit 2516125d5eb2aa1cea12bdacb31560a2075e1f3a
Author: Yaguang Tang <email address hidden>
Date: Wed Aug 21 18:50:38 2013 +0800

    Remove cached console auth token after migration

    After migrating to another server, the cached instance console auth
    tokens become invalid, so we remove the tokens associated with the instance.

    Fix bug #1214829

    Co-authored-by: Takashi Natsume <email address hidden>
    Change-Id: I7fddcd13da128a6bec5e2cdb6fa8c8636d6adb24