This patch set adds a new Alertmanager dashboard to Grafana. Note
that a new configmap is created for this instead of using the
same configmap which includes all the dashboards. Using the same
configmap will eventually run into issue with configmap size limitation.
Change-Id: I10561c0b0b464c3b67d4a738f9f2cb70ef601b3d
5a290e1d83