Umbau Vorstands-Pi zu Vorstands-VM

See merge request !9

# Conflicts:
#	all/common/tasks/main.yml
#	host_vars/vorstandspi
#	hosts
#	site.yml
#	vorstandspi/jameica/tasks/main.yml
#	vorstandspi/mysql/tasks/main.yml

# Conflicts:
#	warpsrvint/docker_grafana/tasks/main.yml
#	warpsrvint/docker_influx/tasks/main.yml
#	warpsrvint/docker_kapacitor/tasks/main.yaml
#	warpsrvint/docker_l4z0r/tasks/main.yml
#	warpsrvint/docker_librenms/tasks/main.yml
#	warpsrvint/docker_matestatdb/tasks/main.yml
#	webserver/docker_alerta/tasks/main.yml
#	webserver/docker_hackmd/tasks/main.yml
#	webserver/docker_keycloak/tasks/main.yml

In the future we probably want to use include_task for that instead