[rennes] Fixes network links

data/grid5000/sites/rennes/network_equipments/gw-rennes.json

@@ -25,6 +25,7 @@
 
         },
         {
+          "kind": "switch",
           "uid": "bigdata-sw"
         }
       ],

generators/input/sites/rennes/net-links/gw-rennes.yaml

@@ -71,7 +71,9 @@ gw-rennes:
       model: WS-X6704-10GE
       ports:
         1: renater-rennes
-        3: bigdata-sw
+        3:
+          uid: bigdata-sw
+          kind: switch
     2:
       kind: node
       naming_pattern: Gi%LINECARD%/%PORT%