[grenoble] network - Fix port-channel on imag-1b-F3-prod-01 switch

Signed-off-by: PARISOT Clement <clement.parisot@inria.fr>

data/grid5000/sites/grenoble/network_equipments/imag-1b-F3-prod-01.json

@@ -3,7 +3,7 @@
   "channels": {
     "lag1": {
       "kind": "router",
-      "port": "lag1",
+      "port": "port-channel50",
       "rate": 50000000000,
       "ssh_name": "lag 1",
       "uid": "gw"

input/grid5000/sites/grenoble/networks/imag-1b-F3-prod-01.yaml

@@ -62,4 +62,4 @@ imag-1b-F3-prod-01:
       kind: router
       rate: 50_000_000_000
       uid: gw
-      port: lag1
+      port: port-channel50