update auth config tests for 0.11

Author: minrk

testing/local-binder-k8s-hub/jupyterhub-chart-config-auth-additions.yaml

@@ -10,8 +10,8 @@ hub:
       oauth_no_confirm: true
       oauth_redirect_uri: "http://127.0.0.1:8585/oauth_callback"
       oauth_client_id: "binder-oauth-client-test"
-
-auth:
-  type: dummy
-  dummy:
-    password: dummy
+  config:
+    JupyterHub:
+      authenticator_class: "dummy"
+    DummyAuthenticator:
+      password: "dummy"