[nancy][gres] change bmc mac adr for gres-5

data/grid5000/sites/nancy/clusters/gres/nodes/gres-5.json

@@ -199,7 +199,7 @@
       "interface": "Ethernet",
       "ip": "172.17.65.5",
       "kavlan": false,
-      "mac": "7c:a6:2a:4e:5e:dc",
+      "mac": "5c:ed:8c:01:2b:48",
       "management": true,
       "mountable": false,
       "mounted": false,