Added BNG dashboard, disabled by default

Also, added BNG topic and dashboard activation in seba-ponsim-sdbng.yaml values file.

Change-Id: Ic188e7504d97681f4a96bd7e68acd0de3d874cbd
diff --git a/nem-monitoring/templates/grafana-dashboard-configmap.yaml b/nem-monitoring/templates/grafana-dashboard-configmap.yaml
index 9d7c0e2..15d89fa 100644
--- a/nem-monitoring/templates/grafana-dashboard-configmap.yaml
+++ b/nem-monitoring/templates/grafana-dashboard-configmap.yaml
@@ -68,3 +68,7 @@
   aether-edge-pods.json: |
 {{ .Files.Get "grafana-dashboards/aether-edge-pods.json" | indent 4 }}
 {{- end }}
+{{- if .Values.dashboards.bng }}
+  bng-dashboard.json: |
+{{ .Files.Get "grafana-dashboards/bng-dashboard.json" | indent 4 }}
+{{- end }}