added oauth2 support

defaults/main.yml

@@ -4,6 +4,15 @@ grafana:
     secret_key: "{{ lookup('password', '/dev/null') }}"
     instance_name: "${HOSTNAME}"
     root_url: "https://localhost"
+    oauth2:
+      enabled: "false"
+      name: "OAuth"
+      client_id: ""
+      client_secret: ""
+      auth_url: ""
+      token_url: ""
+      api_url: ""
+      scopes: ""
   plugins:
     "grafana-piechart-panel": {}
   datasources: {}