Servan FPGA/ethernet

devrait corriger https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=14125

data/grid5000/sites/grenoble/clusters/servan/nodes/servan-1.json

@@ -278,7 +278,7 @@
       "device": "fpga0",
       "driver": "n/a",
       "enabled": true,
-      "interface": "Ethernet",
+      "interface": "FPGA/Ethernet",
       "ip": "172.16.23.11",
       "ip6": "2001:660:4406:100:8:1:0:1",
       "kavlan": true,
@@ -300,7 +300,7 @@
       "device": "fpga1",
       "driver": "n/a",
       "enabled": true,
-      "interface": "Ethernet",
+      "interface": "FPGA/Ethernet",
       "ip": "172.16.23.21",
       "ip6": "2001:660:4406:100:8:2:0:1",
       "kavlan": true,