This requires stackhpc.os-images v1.10.0 or newer, for compatibility
with CentOS 8 when SELinux is enabled: we disable SELinux, but without
rebooting it stays enabled.

This Ansible role was updated to v1.10.2 in master and stable/victoria
by I5efdbd52556721914fe69d7c6ba454b2c721b643, for another reason.
Remember to bump the requirement when backporting to earlier releases.

It also needs changes in the way we interact with Bifrost to avoid using
the env-vars file which has been removed. This is implemented by change
I25078e69acdf41a4ef9957f99fe5047de54b778d.

Finally, it requires building seed deployment images only after
deploying Bifrost, because the task copying images onto the seed expects
/etc/kolla/bifrost to exist.

We also copy log files to identify issues when the job fails.

Change-Id: I4719b4d397c01b35c78cb84c6d686dd27742d1c0