Fix Octavia periodic stable grafana
Fix Octavia periodic stable grafana

The metric path was wrong for the three periodic stable jobs.
Updating with periodic-stable.

Change-Id: If6e0b1e7062f5baf1ee60b21cdc0d5af99561b5f

Tesora/tesora-project-config,openstack-infra/project-config,openstack-infra/project-config,Tesora/tesora-project-config