[nancy][grdix-srv] add ib address

data/grid5000/sites/nancy/servers/grdix-srv.json

@@ -16,6 +16,9 @@
     "default": {
       "ip": "172.16.79.31",
       "mac": "9c:63:c0:aa:4e:08"
+    },
+    "ibs3": {
+      "ip": "172.18.77.229"
     }
   },
   "redfish": true,