Add missing grafana plugins from upstream kolla

Author: technowhizz

etc/kayobe/kolla.yml

@@ -320,7 +320,9 @@ kolla_build_blocks:
     ADD additions-archive /
   grafana_plugins_install: |
     RUN grafana-cli plugins install vonage-status-panel \
-        && grafana-cli plugins install grafana-piechart-panel
+        && grafana-cli plugins install grafana-piechart-panel \
+        && grafana-cli plugins install grafana-opensearch-datasource \
+        && grafana-cli plugins install gnocchixyz-gnocchi-datasource
   ironic_inspector_header: |
     ADD additions-archive /
   magnum_base_footer: |