Bump arcus/stein to stable/stein Kolla tag 8.0.3
Kolla and Kolla-Ansible forks rebased to latest stein/stable and patches carried forward.
Kayobe-Config repo merged with latest upstream and container tags bumped to Kolla tag 8.0.3
Minor fixes in Kayobe-Config:
- Add ak2271 public key to system users
- Fix Prometheus AM base system rules and Slack receiver
- Decrease concurrency to S6010-ON switches until etcd locking can be investigated more