Comment 4 for bug 1706118

Reviewed: https://review.openstack.org/486660
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=05f3d9d39b7b95fac343ba431855482a5d96584a
Submitter: Jenkins
Branch: master

commit 05f3d9d39b7b95fac343ba431855482a5d96584a
Author: Matt Riedemann <email address hidden>
Date: Mon Jul 24 11:30:35 2017 -0400

    Provide hints when nova-manage db sync fails to sync cell0

    Lots of people get tripped up on the error message when
    syncing cell0 fails and the question asked is confusing and
    possibly misleading, so this change includes several questions
    for troubleshooting and also dumps the actual error message.

    Related-Bug: #1706118

    Change-Id: I865f76705f10493152af50b9842c6fedc563fea4