Cern stein release 1rc0

• Add metrics_producer magnum label (CERN internal) - OS-8917
• Add npd_enabled to enable/disable npd on the cluster - OS-9381
• Fix some of the grafana dashboards are not showing - OS-9386 (temporary)

RPM: https://gitlab.cern.ch/cloud-infrastructure/openstack-magnum/merge_requests/97