[nancy/grouille] Add grouille cluster in default queue and type exotic

data/grid5000/sites/nancy/clusters/grouille/grouille.json

 {
   "created_at": "Wed, 13 Jan 2021 00:00:00 GMT",
-  "exotic": false,
+  "exotic": true,
   "kavlan": true,
   "metrics": [
     {
@@ -215,7 +215,7 @@
   "model": "Dell PowerEdge R7525",
   "queues": [
     "admin",
-    "testing"
+    "default"
   ],
   "type": "cluster",
   "uid": "grouille"