def teardown(self):
        '''Teardown device service cluster group.'''

        self.ensure_all_devices_in_sync()
        for device in self.devices:
            self._delete_device_from_device_group(device)
            self._sync_to_group(device)
            pollster(self._ensure_device_active)(device)
            self.ensure_all_devices_in_sync()
        dg = pollster(self._get_device_group)(self.devices[0])
        dg.delete()
        pollster(self._check_devices_active_licensed)()
        pollster(self._check_all_devices_in_sync)()
Teardown device service cluster group.