[rennes] Add new servers

data/grid5000/sites/rennes/servers/srv-1.json

+{
+  "alias": [
+
+  ],
+  "kind": "physical",
+  "network_adapters": {
+    "bmc": {
+      "ip": "172.17.111.51"
+    },
+    "default": {
+      "ip": "172.16.111.51"
+    }
+  },
+  "serial": "CZJ3151FJV",
+  "type": "server",
+  "uid": "srv-1",
+  "warranty": "YYYY-MM"
+}
\ No newline at end of file