Return a list containing a single service's info if `name`
        is supplied, else returns a list of all services' info.

def status(self, name=''):
        """Return a list containing a single service's info if `name`
        is supplied, else returns a list of all services' info.
        """
        logger.warn(
            'Note that `status` is currently not so robust and may break on '
            'different systems')
        init = self._get_implementation(name)
        if name:
            self._assert_service_installed(init, name)
        logger.info('Retrieving status...')
        return init.status(name)