Comment 5 for bug 1708171

Reviewed: https://review.openstack.org/490061
Committed: https://git.openstack.org/cgit/openstack/trove/commit/?id=0fb67d459baa0fb22391b1b1da3dba5349666bb7
Submitter: Jenkins
Branch: master

commit 0fb67d459baa0fb22391b1b1da3dba5349666bb7
Author: Matt Riedemann <email address hidden>
Date: Wed Aug 2 11:46:16 2017 -0400

    Fix AttributeError in api example snippets tests

    Change I3f020b6bcb1b9bf6d18a3b4f738c13cccd1bbff8 in
    python-troveclient 2.11.0 changed the
    troveclient.compat.client._logger variable to be a LOG
    variable.

    I have no idea how this hasn't been breaking the Trove
    API examples CI job since python-troveclient 2.11.0 was
    released. Maybe it has an no one has noticed or cared to
    fix it.

    Anyway, this adds hasattr checking in the test code to
    set the log level on the correct variable based on which
    version of troveclient is being used.

    Also - no idea why setting the log level in the client
    for these API tests is even necessary, but this dates back
    to a change in 2014 so who knows. Not me.

    --

    This also fixes bug 1708171 by making nova run in
    singleconductor mode so the affinity/anti-affinity
    scheduling tests work. Trove CI is blocked by both
    changes so they have to go together.

    Change-Id: Iaf00fc55336a8049c8303b8fa2849df2366115e6
    Closes-Bug: #1708190
    Closes-Bug: #1708171