The 'kayobe * host configure' commands no longer use the 'kolla-ansible
bootstrap-servers' command, and associated 'baremetal' role in Kolla
Ansible. The functionality provided by the 'baremetal' role has been
extracted into the openstack.kolla Ansible collection, and split
into separate roles. This allows Kayobe to use it directly, and only the
necessary parts.

This change improves failure handling in these Kayobe commands, and aims
to reduce confusion over which '--limit' and '--tags' arguments to
provide.  This ensures that if a host fails during a host configuration
command, other hosts are able to continue to completion. Previously, if
any host failed during the Kayobe playbooks, the 'kolla-ansible
bootstrap-servers' command would not run. This is useful at scale, where
host failures occur more frequently.

This change has implications for configuration of Kayobe, since some
variables that were previously in Kolla Ansible are now in Kayobe.

Several parts of the baremetal role have been split out and used here:

* apparmor-libvirt: disable AppArmor rules for libvirt on Ubuntu.
* docker: Docker installation & configuration. The docker role in
  openstack.kolla combines functionality from kolla-ansible and kayobe.
* etc-hosts: it proved difficult to generalise this, so we have some
  almost duplicated the code from kolla-ansible here. Requires delegated
  fact gathering for the case when --limit is used.
* firewall: support to disable UFW, for feature parity.
* kolla-packages: miscellaneous package installs & removals.

The addition of the stack user to the docker group has been moved to the
user bootstrapping playbook, and the docker SDK installation has been
moved to the virtualenv setup playbook.

Depends-On: https://review.opendev.org/c/openstack/ansible-collection-kolla/+/829587

Story: 2009854
Task: 44505

Change-Id: I61a61ca59652b13687c2247d5881012b51f666a7

Currently, the overcloud host configure test results are only returned
on success, when they are least useful. This is because the zuul_return
task is not reached when the test task fails. This change reorders the
tasks to fix the issue.

Change-Id: Ie572eda567782cc377767bd8d925145e2ad4bd61

Change-Id: Iff105f9a491dc6277586c1d53b84747c38feb585

Change-Id: Icb57b908be9c83700274c042185e4481d5ca6ea5

This gives us some test coverage with Ansible Vault.

Change-Id: Ic9db7f84e9f0dcbe69c31b6fff6bda3dfb401a33
Story: 2004959
Task: 39813

Tests various non-default configuration:

* Custom users
* Network interfaces, VLANs, bridges, bonds
* Software RAID
* LVM & docker devicemapper
* timezone
* Package mirrors
* yum-cron / DNF automatic

This improved test coverage allows us to be more confident about these
features working on CentOS 8.

Change-Id: I36148e4356deb7d5ec00d8d3ebeb2d3932ff4f94
Story: 2006574
Task: 38938