Comment 4 for bug 1374140

Reviewed: https://review.openstack.org/124178
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=1af3ca69c250f8cd2f8e60ed596ad2df30353713
Submitter: Jenkins
Branch: master

commit 1af3ca69c250f8cd2f8e60ed596ad2df30353713
Author: Matt Riedemann <email address hidden>
Date: Thu Sep 25 13:44:46 2014 -0700

    libvirt: log exception info when interface detach failed

    The detach_interface method is catching a libvirtError and logging an
    error message but it doesn't include the contents of the root
    libvirtError, so log that information as well for debugging.

    Closes-Bug: #1374140

    Change-Id: I042c2956c7393a2ee1ccd026421c8df537aa1a87