Grafana dashboards

[rdxmb]

This PR

• adds $project to the legend. This is useful when having multiple projects.
• adds another dashboard with template variables (dropdown) for $project and $region

see https://github.com/vfm/syseleven-exporter-chart/issues/12

[rdxmb]

It feels oversized for the scope of the deployed software

In my case, with about 8 openstack-projects, the one and only dashboard - feels overloaded ;)

But it's ok, I am going to create my own 2-3 dashboards and deploy them separately.

Closing this.