Add new DEFAULT option named "my_ipv6"

Add a new config parameter named "my_ipv6".
The default value for my_ipv6 will be the IPv6 address
of the interface used for the default gateway.

This new option is not used for now in any neutron code,
but may be used by operators to configure other options
(like local_ip, ovsdb_connection, etc.).

Requires oslo.utils version 6.2.0.

Change-Id: Icd802879e56aec00793b3683e84b16847d1c798d

neutron/conf/common.py

@@ -161,6 +161,10 @@ core_opts = [
                help=_('IPv4 address of this host. If no address is provided '
                       'and one cannot be determined, 127.0.0.1 will be '
                       'used.')),
+    cfg.StrOpt('my_ipv6', default=netutils.get_my_ipv6(),
+               help=_('IPv6 address of this host. If no address is provided '
+                      'and one cannot be determined, ::1 will be '
+                      'used.')),
 ]
 
 core_cli_opts = [

releasenotes/notes/new-my-ipv6-config-361b5dc824591fe5.yaml

@@ -0,0 +1,9 @@
+---
+other:
+  - |
+    Add a new config option in DEFAULT section named ``my_ipv6``.
+    This new config option will be set by default to the local IPv6 configured
+    to reach the default gateway.
+    This new setting might be useful for operators that need to configure this
+    IP in another part of their config (like OVS/local_ip) without relying on
+    any external templating system.

requirements.txt

@@ -44,7 +44,7 @@ oslo.rootwrap>=5.15.0 # Apache-2.0
 oslo.serialization>=2.25.0 # Apache-2.0
 oslo.service>=2.8.0 # Apache-2.0
 oslo.upgradecheck>=1.3.0 # Apache-2.0
-oslo.utils>=4.8.0 # Apache-2.0
+oslo.utils>=6.2.0 # Apache-2.0
 oslo.versionedobjects>=1.35.1 # Apache-2.0
 osprofiler>=2.3.0 # Apache-2.0
 os-ken>=2.2.0 # Apache-2.0