code: def delete_external_store(self, project_name, store_name):
          
          headers = {}
          params = {}
          resource = "/externalstores/" + store_name
          (resp, header) = self._send("DELETE", project_name, None, resource, params, headers)
          return DeleteExternalStoreResponse(header, resp)
docs: delete log store
          Unsuccessful opertaion will cause an LogException.
  
          :type project_name: string
          :param project_name: the Project name 
  
          :type store_name: string
          :param store_name: the external store name
  
          :return: DeleteExternalStoreResponse
          
          :raise: LogException