Fix monitoring

[ostempel]

Description

Add monitoring roles to mini-lab.

Setup:

• expose ports of grafana, loki and prometheus
• make control plane ip configurable
• change metal-api replicas because of alert-rule
• increase RAM of switches

Prometheus:

• add remote write
• add leaves to /etc/hosts

Monitoring:

• setup node-exporter
• setup blackbox-exporter
• setup sonic-exporter
• setup ipmi-exporter
• setup blackbox-exporter

Sonic:

• add ntp servers
• mock platform data for sonic-exporter

Promtail:

• scrape docker containers