[grue] Add benchmark and max_walltime for grue

data/grid5000/sites/nancy/clusters/grue/nodes/grue-1.json

@@ -170,8 +170,8 @@
     "turboboost_enabled": true
   },
   "performance": {
-    "core_flops": 0,
-    "node_flops": 0
+    "core_flops": 13438000000,
+    "node_flops": 430760000000
   },
   "processor": {
     "cache_l1": null,
@@ -208,7 +208,7 @@
   "supported_job_types": {
     "besteffort": true,
     "deploy": true,
-    "max_walltime": 0,
+    "max_walltime": 86400,
     "queues": [
       "admin",
       "testing"