'Initialize a Manager object appropriate for this service.
Use the service name to look up a Manager subclass from the
configuration and initialize an instance. If no class name
is configured, just return None.
:returns: a Manager instance, or None.'

def _get_manager(self):

    manager = SERVICE_MANAGERS.get(self.binary)
    if (manager is None):
        return None
    manager_class = importutils.import_class(manager)
    return manager_class()
