Drop netaddr - use netutils.is_valid_ipv6()

Change I8c595830b8c7974c651a9e524b57a6540e4f3d1f
added a dependency on netaddr. Ironic did'nt directly
depend on netaddr prior to this.

This removes the use of netaddr, netutils.is_valid_ipv6()
is used instead.

Also update the releasenote to clarify that the support
for allocating multiple IPv6 addresses fixes provisioning
on DHCPv6-stateful networks.

Story: 2007315
Task: 39321
Change-Id: I976bf9cee6fd10736f9fc88ca816266651b979c6

ironic/common/neutron.py

@@ -13,10 +13,10 @@
 import copy
 
 from keystoneauth1 import loading as ks_loading
-import netaddr
 from neutronclient.common import exceptions as neutron_exceptions
 from neutronclient.v2_0 import client as clientv20
 from oslo_log import log
+from oslo_utils import netutils
 from oslo_utils import uuidutils
 import retrying
 
@@ -247,7 +247,7 @@ def _add_ip_addresses_for_ipv6_stateful(context, port, client):
     """
     fixed_ips = port['port']['fixed_ips']
     if (not fixed_ips
-            or netaddr.IPAddress(fixed_ips[0]['ip_address']).version != 6):
+            or not netutils.is_valid_ipv6(fixed_ips[0]['ip_address'])):
         return
 
     subnet = client.show_subnet(

releasenotes/notes/dhcpv6-stateful-address-count-0f94ac6a55bd9e51.yaml

@@ -6,4 +6,9 @@ features:
     cleaning, rescue or inspection. The new parameter
     ``[neutron]/dhcpv6_stateful_address_count`` controls the number of addresses
     to allocate (Default: 4).
-
+fixes:
+  - |
+    The 'no address available' problem seen when network booting on
+    DHCPv6-stateful networks is fixed with the support for allocating multiple
+    IPv6 addresses. See `bug: 1861032
+    <https://bugs.launchpad.net/neutron/+bug/1861032>`_.