feat: Influxdb dashboards

[vgratian]

This PR provides dashboards for the InfluxDB by me and @SamyukthaM. It also fixes #430.

• At the current state, the dashboards can not be imported with the grafana-tool. This will be fixed with a different PR.
• PR includes 8 dashboards, they are far from complete or perfect, but it's a start
  • most are based on our Prometheus-dashboards, but also introduce several improvements
  • they are tested only against cdot systems, they should work for 7modes to the same extend as our Prometheus-based dashboards, but since we are likely to split them up, I did not spend time here
• A few things were necessary to fix:
  • the InfluxDB exporter will check for conflicting metric names and rename them
  • duplicate metrics interfere with some dashboards, that's why I removed update from conf/zapiperf/cdot/9.8.0/system_node.yaml (exact same metric is collected by the Zapi collector)
  • writing 7mode data to the same bucket as cdot is unsafe, this is documented
    exporter and a few minor fixes. Important: these dashboards

[cgrinds]

Thanks @SamyukthaM and @vgratian - these look good!

One comment about 7-mode: Harvest does not support InfluxDB dashboards for 7-mode