WIP: Adding dashboard directory for grafana dashboards and script to combine the dashboards

[imrajdas]

• fixes: https://github.com/prometheus/test-infra/issues/420
• Changes:
  • Moving grafana-dashboard config to dashboards directory with separate json
  • Adding apply/delete for grafana-dashboard config
  • Combing both dashboards JSON

Signed-off-by: Raj Babu Das [email protected]

[imrajdas]

cc @geekodour. dashboard's configmap is successfully created in this way. I check the text diff with the previous config map. It looks the same(except the JSON format changes).

But after applying all resources, the dashboards are not showing in the grafana. I will fix this problem later. Let me know if this approach is good or not.

[imrajdas]

Thanks @geekodour for reviewing this PR. I will come up with a better solution using bash script.