dell-product-data: add louvain (empty hash), rm grvingt-33 (retired)

input/grid5000/dell-product-data.yaml

@@ -266,6 +266,8 @@ sites:
             chassis:
               manufactured_at: 2018-07-17
               warranty_end: 2023-07-17
+  louvain:
+    clusters: {}
   luxembourg:
     clusters:
       petitprince:
@@ -1322,10 +1324,6 @@ sites:
             chassis:
               manufactured_at: 2018-04-10
               warranty_end: 2023-04-10
-          grvingt-33:
-            chassis:
-              manufactured_at: 2018-04-10
-              warranty_end: 2023-04-10
           grvingt-34:
             chassis:
               manufactured_at: 2018-04-10