netdev-util: allow setting local address based on dhcp-pd addresses as well (#38211)

This extends the functionality introduced in #21648 to allow using
addresses chosen from a delegated prefix as well as the existing
SLAAC/LL/DHCP functionality.

tools/vcs-tag.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # SPDX-License-Identifier: LGPL-2.1-or-later
 set -e