Comment 8 for bug 1762419

We also don't appear to capture the builder log from this step:

https://github.com/openstack/tripleo-quickstart/blob/master/roles/convert-image/tasks/main.yml#L50

```
- name: collect diagnostic log from undercloud image
  shell: >
    virt-cat -a undercloud.qcow2 /tmp/builder.log > builder-undercloud.log 2>&1;
  changed_when: true
  args:
    chdir: "{{ convert_image_working_dir }}"
  environment:
    LIBGUESTFS_BACKEND: direct
    LIBVIRT_DEFAULT_URI: "{{ libvirt_uri }}"
```

Example:

https://logs.rdoproject.org/openstack-periodic/periodic-tripleo-ci-centos-7-ovb-1ctlr_1comp-featureset002-master-upload/dac32bd

The output from the VC command is spammed to the console log, and with some work can be made usable. Ideally part of fixing this issue is capturing builder-undercloud.log, as this is the canonical log of all changes to the UC