Description of problem:

FFU 16.2 - 17.1 document, section 5.1 [0], procedure step #3 says:

~~~
Verify that the following files that were exported during the undercloud upgrade contain the expected configuration for the overcloud upgrade...
~~~
and there's a note that reads:
~~~
If the files were not generated after the undercloud upgrade, contact Red Hat Support.
~~~

Red Hat support has no information about the background of this known issue and has no idea what to do with it. BZ or Jira should be referenced in the note, so that we can create a KCS article with further troubleshooting instructions o a workaround procedure.

[0] https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/17.1/html-single/framework_for_upgrades_16.2_to_17.1/index#running-the-overcloud-upgrade-preparation_overcloud-adoption