Comment 4 for bug 1667147

@Alex, I tried the snippet you mentioned and this one https://github.com/openstack/tripleo-heat-templates/blob/master/puppet/services/nova-compute.yaml#L161-L165 and they didn't nuke the nova.conf. For the puppet part, it cannot be a purge => true as the nova.conf has the compute_level set. It's as if the nova.conf was empty to start with and then filled up by the two changes done to it during the upgrade.

@Marios, would be interesting to see why you and marius don't have this error.