message: fix config scen gen
diff: " self.param_servers = []\n",
  "\n",
  " def create_from_config(self, config_param_object, road_corridor, agent_states, **kwargs):\n",
  - " model_types = config_param_object[\"ModelType\", \"Type of behavior model \\\n",
  - " used for all vehicles\", [\"BehaviorIDMClassic\", \"BehaviorMobil\"]]\n",
  + " model_types = config_param_object[\"ModelTypesList\", \"Type of behavior model\" \\\n",
  + " \"used for all vehicles\", [\"BehaviorIDMClassic\", \"BehaviorMobil\"]]\n",
  " model_params = config_param_object.AddChild(\"ModelParams\")\n",
  - " print(model_types)\n",
  " # ----- DEFAULT PARAMETER HANDLING\n",
  " # based on types retrieve default params which are maintained as scenario defaults\n",
  " for model_type in model_types:\n",
  - " print(model_type)\n",
  - " # behavior_params = model_params.AddChild(model_type)\n",
  - " # _, _ = self.model_from_model_type(model_type, behavior_params)\n",
  + " behavior_params = model_params.AddChild(model_type)\n",
  + " _, _ = self.model_from_model_type(model_type, behavior_params)\n",
  " #param server must be persisted for each behavior to enable serialization of parameters\n",
  - " #self.param_servers.append(behavior_params) \n",
  + " \n",
  "\n",
  " #------ BEHAVIOR MODEL SAMPLING\n",
  - " #behavior_models = []\n",
  - " #behavior_model_types = []\n",
  - " #for _ in agent_states:\n",
  - " # model_idx = self.random_state.randint(low=0, high=len(model_types), size=None) \n",
  - " # model_type = model_types[model_idx]\n",
  - " # bark_model, params = self.model_from_model_type(model_type, model_params)\n",
  - " # behavior_models.append(bark_model)\n",
  - " # behavior_model_types.append(model_type)\n",
  - " #return behavior_models, {\"behavior_model_types\" : behavior_model_types}, config_param_object\n",
  + " behavior_models = []\n",
  + " behavior_model_types = []\n",
  + " for _ in agent_states:\n",
  + " model_idx = self.random_state.randint(low=0, high=len(model_types), size=None) \n",
  + " model_type = model_types[model_idx]\n",
  + " model_type_params = model_params.AddChild(model_type)\n",
  + " params = ParameterServer()\n",
  + " bark_model, params = self.model_from_model_type(model_type, model_type_params)\n",
  + " self.param_servers.append(model_type_params) \n",
  + " behavior_models.append(bark_model)\n",
  + " behavior_model_types.append(model_type)\n",
  + " return behavior_models, {\"behavior_model_types\" : behavior_model_types}, config_param_object\n",
  "\n",
  " def model_from_model_type(self, model_type, params):\n",
  " bark_model = eval(\"{}(params)\".format(model_type)) \n",
  