Add disks' storage type in in put file, and fix some clusters with g5k-checks detection

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

@@ -250,7 +250,7 @@
       "interface": "SATA",
       "model": "PERC H330 Adp",
       "size": 479559942144,
-      "storage": "SSD",
+      "storage": "HDD",
       "vendor": "Dell"
     }
   ],