In our system-config-run-grafana job we were not taking screenshots of
the dashboard pages. The project-config job does do this. Port over the
listing of dashboards and screenshots of each dashboard into
system-config so that we can be more confident in updating the grafana
container image.
In particular we are concerned about CORS issues and this should help us
confirm that data loads from external sources (graphite) properly.
Change-Id: Ib9b597fd724219bd8d3155515d954a44589b0b07