'Add a single node to this cluster'

def add_node(self, alias=None, no_create=False, image_id=None, instance_type=None, zone=None, placement_group=None, spot_bid=None):

    aliases = ([alias] if alias else None)
    return self.add_nodes(1, aliases=aliases, image_id=image_id, instance_type=instance_type, zone=zone, placement_group=placement_group, spot_bid=spot_bid, no_create=no_create)
