Comment 4 for bug 1634282

Reviewed: https://review.openstack.org/454593
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=a96092d0e48fef62d257acf0428ddb6daf07d3a4
Submitter: Jenkins
Branch: stable/newton

commit a96092d0e48fef62d257acf0428ddb6daf07d3a4
Author: Stephen Finucane <email address hidden>
Date: Wed Nov 2 12:43:35 2016 +0000

    Ignore IOError when creating 'console.log'

    In 'd4e6bd8', and later refined in 'ec6ed24c', an issue with the the
    Quobyte CI was resolved by ensuring that the 'console.log' file is
    always created, even when libvirt's 'dynamic_ownership' config option
    is set to '0'. However, attempting to take ownership of this file can
    cause issues when 'dynamic_ownership' is set to '1' and a user attempts
    to reschedule an instance to a host where it was previously located. In
    this case, the permissions on the file have already been co-opted by
    libvirt, and attempting to change them results in an IOError.

    The easiest fix for this is to simply ignore the IOError, as the file
    already exists and libvirt has set correct permissions already. This is
    what do here. A longer term fix would be to avoid changing the
    permissions only for the offending Quobytes block devices, but this is
    likely not backportable and will be done in a follow-up fix.

    Change-Id: I353afd57be207330757580447a1b606c7b9b7c09
    Partial-bug: #1634282
    Related-bug: #1597644
    Related-bug: #1609298
    (cherry picked from commit 1848860fd4fb6dfb2ead1f8271050d36df592205)