def list_workers(self, directory):
        for root, subFolders, files in os.walk(directory):
            for filename in files:
                if re.match(self.naming_scheme, filename):
                    self.load_plugin_from_file(filename)
lists files matching the naming_schema of the workers and loads
dataset/ETHPy150Open felskrone/salt-eventsd/salteventsd/backends.py/BackendMngr.list_workers