[nancy][graphique] Update MAC address of BMC

data/grid5000/sites/nancy/clusters/graphique/nodes/graphique-2.json

@@ -161,7 +161,7 @@
       "interface": "Ethernet",
       "ip": "172.17.67.2",
       "kavlan": false,
-      "mac": "18:fb:7b:9b:91:55",
+      "mac": "44:a8:42:3a:58:0d",
       "management": true,
       "mountable": false,
       "mounted": false,

input/grid5000/sites/nancy/clusters/graphique/nodes/graphique-2.yaml

@@ -38,7 +38,7 @@ graphique-2:
   network_adapters:
     bmc:
       ip: 172.17.67.2
-      mac: 18:fb:7b:9b:91:55
+      mac: 44:a8:42:3a:58:0d
       management: true
     eth0:
       driver: bnx2x