Add data plane and agents to the Grafana dashboard

This patch adds a new dashboard if Neutron is deployed with OpenvSwitch
support. It also ensures that only the Neutron server is providing a
dashboard because otherwise you can have other kinds of nodes that
don't run Neutron and that will push the wrong dashboard.
Change-Id: I55e7b84e7d7fd06619f5671c15964b39d5943514
2 files changed