Comment 8 for bug 971621

Reviewed: https://review.openstack.org/10655
Committed: http://github.com/openstack/nova/commit/a5184d5dbf67630dac3abb69b1678b60807cfce7
Submitter: Jenkins
Branch: master

commit a5184d5dbf67630dac3abb69b1678b60807cfce7
Author: Pádraig Brady <email address hidden>
Date: Wed Aug 1 14:26:54 2012 +0100

    fix unmounting of LXC containers

    There were two issues here.

    1. There was a global object stored for all instances,
    thus the last mounted instance was always unmounted.

    2. Even if there was only a single LXC instance in use,
    the global object would be lost on restart of Nova.

    Therefore we reset the internal state for the mount object,
    by passing in the mount point to destroy_container(),
    and querying the device in use for that mount point.

    Fixes bug: 971621
    Change-Id: I5442442f00d93f5e8b82f492d62918419db5cd3b