Fix Stacklight installation stage in the pipelines

- start SL docker swarm services after preparing configuration for
them
- now alerta will be configured in the scope of prometheus state run
- Prometheus LTS runs after containerized Prometheus is deployed
Change-Id: Ic615040fcef8d3f4383393b1ca2e0d25cbbf1f01
Related-PROD: PROD-20522
1 file changed