Change validate method to work for all storages

storage/local.py

@@ -115,6 +115,8 @@ class LocalStorage(BaseStorageV2):
     os.remove(content_path)
 
   def validate(self, client):
+    super(LocalStorage, self).validate()
+
     # Load the set of disk mounts.
     try:
       mounts = psutil.disk_partitions(all=True)