[nancy][grue] Add switch info on eth0 interface

data/grid5000/sites/nancy/clusters/grue/nodes/grue-1.json

@@ -99,8 +99,8 @@
       "name": "eno1",
       "network_address": "grue-1.nancy.grid5000.fr",
       "rate": 10000000000,
-      "switch": null,
-      "switch_port": null,
+      "switch": "gw-nancy",
+      "switch_port": "Ethernet7/15",
       "vendor": "Intel"
     },
     {