Update Grafana repo URL to SAP fork
Update Grafana repo URL to SAP fork

Change-Id: I0a1eab4b172cb41909e210b422fd6e602728e5e3

stackforge/monasca-api,stackforge/monasca-api,stackforge/monasca-api,openstack/monasca-api,stackforge/monasca-api,openstack/monasca-api,openstack/monasca-api