Retire the interop-wg mailing list

This list's owners have asked for it to be shut down, as they will
be using an [interop-wg] tag on the new openstack-discuss ML for
future communication. Once this merges (so that Puppet won't
recreate it), the list can be removed with the `rmlist` utility
(this will still leave the archives available but will remove it
from the list index and no longer accept subscriptions/posts).

Set the old list address as an alias for the new openstack-discuss
ML so that replies to previous messages from the list will be routed
there for the foreseeable future.

Change-Id: Ib5fd5aece2465d569e0e7c180ee14ba94882f2b7

modules/openstack_project/manifests/lists.pp

@@ -230,14 +230,6 @@ class openstack_project::lists(
     description => 'Discussions of the OpenStack Foundation Core Definition Committee',
   }
 
-  mailman_list { 'interop-wg@openstack':
-    require     => Mailman::Site['openstack'],
-    ensure      => present,
-    admin       => 'chris@openstack.org',
-    password    => $listpassword,
-    description => 'Discussions of the OpenStack Foundation Board Interoperability Working Group',
-  }
-
   mailman_list { 'ambassadors@openstack':
     require     => Mailman::Site['openstack'],
     ensure      => present,

playbooks/host_vars/lists.openstack.org.yaml

@@ -2,6 +2,7 @@ mm_domains: 'lists.openstack.org:lists.zuul-ci.org:lists.airshipit.org:lists.sta
 exim_local_domains: "@:{{ mm_domains }}"
 exim_aliases:
   root: "{{ ','.join(listadmins|default([])) }}"
+  interop-wg: openstack-discuss
   openstack: openstack-discuss
   openstack-dev: openstack-discuss
   openstack-operators: openstack-discuss