[nancy][network][gratouille] add network link to gw

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

@@ -110,8 +110,8 @@
       "rate": 10000000000,
       "sriov": true,
       "sriov_totalvfs": 63,
-      "switch": null,
-      "switch_port": null,
+      "switch": "gw",
+      "switch_port": "Ethernet7/14",
       "vendor": "Intel"
     },
     {