[luxembourg] Add kwollect-bullseye VM

data/grid5000/sites/luxembourg/servers/kwollect-bullseye.json

+{
+  "kind": "virtual",
+  "network_adapters": {
+    "default": {
+      "ip": "172.16.191.131"
+    }
+  },
+  "type": "server",
+  "uid": "kwollect-bullseye"
+}
\ No newline at end of file

input/grid5000/sites/luxembourg/servers/virtual.yaml

@@ -161,3 +161,8 @@ guix:
   network_adapters:
     default:
       ip: 172.16.191.130
+kwollect-bullseye:
+  kind: virtual
+  network_adapters:
+    default:
+      ip: 172.16.191.131