Merge "Test upgrades in CI"

dev/functions

dev/overcloud-upgrade.sh

doc/source/development/automated.rst

playbooks/kayobe-overcloud-base/pre.yml

playbooks/kayobe-overcloud-upgrade-base/globals.yml.j2

playbooks/kayobe-overcloud-upgrade-base/overrides.yml.j2

playbooks/kayobe-overcloud-upgrade-base/post.yml

playbooks/kayobe-overcloud-upgrade-base/pre.yml

playbooks/kayobe-overcloud-upgrade-base/run.yml

playbooks/kayobe-seed-base/pre.yml

roles/kayobe-ci-prep/tasks/main.yml

roles/kayobe-diagnostics/files/get_logs.sh

zuul.d/jobs.yaml

zuul.d/project.yaml