[rennes][abacus28] Add network topology

data/grid5000/sites/rennes/clusters/abacus28/nodes/abacus28-1.json

@@ -181,8 +181,8 @@
       "rate": 10000000000,
       "sriov": false,
       "sriov_totalvfs": 0,
-      "switch": null,
-      "switch_port": null,
+      "switch": "sw-1-c003",
+      "switch_port": "ethernet1/1/15",
       "vendor": "Intel"
     },
     {