Update neutron rally job in grafana dashboard config
Update neutron rally job in grafana dashboard config

Neutron rally job was renamed in [1]. This patch updates it
also in config of Neutron failures Grafana dashboard.

[1] https://review.openstack.org/#/c/558037/

Change-Id: Ibd95a05f2196fbbc48a039c4ef14cbebed801486

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