'Delete loadbalancers in the old dict that aren\'t in the new dict.'

def _update_nodes_delete(self, lb, prop_diff):

    if (self.NODES not in prop_diff):
        return True
    old_nodes = (lb.nodes if hasattr(lb, self.NODES) else None)
    new_nodes = prop_diff[self.NODES]
    if (not self._nodes_need_update_delete(old_nodes, new_nodes)):
        return True
    (old, new, deleted, added, updated) = self._nodes_update_data(lb, prop_diff)
    for node in deleted:
        try:
            old[node].delete()
        except Exception as exc:
            if lb_immutable(exc):
                return False
            raise
    return False
