Comment 6 for bug 1680395

Actually the default roles_data excludes computes from the main upgrade step.

https://github.com/openstack/tripleo-heat-templates/blob/24a5fd643919bd3197d1ccc7f70273a9a70511e9/roles_data.yaml#L143

Excluding compute is probably correct and we should implement the compute part of the upgrade as a separate part of the workflow.