Remove device from device service cluster group.

        :param device: ManagementRoot object -- device to delete from group

def _delete_device_from_device_group(self, device):
        '''Remove device from device service cluster group.

        :param device: ManagementRoot object -- device to delete from group
        '''

        device_name = get_device_info(device).name
        dg = pollster(self._get_device_group)(device)
        device_to_remove = dg.devices_s.devices.load(
            name=device_name, partition=self.partition
        )
        device_to_remove.delete()