Fix ceph failure rate grafana dashboard
Fix ceph failure rate grafana dashboard

This updates the stats to the latest locations found on
https://graphite.opendev.org and changes the dashboard to show two
panels: one for the nova job and one for the cinder job, since CI
jobs have moved under projects.

Change-Id: I959627e877de09fca847a809a94a4e8be859149c

openstack-infra/project-config,openstack-infra/project-config