Change openstack-dev to openstack-discuss

Mailinglists have been updated. Openstack-discuss replaces
openstack-dev.

Change-Id: I848598c6aa4fb40f759302da1a830d1f19ac06a2

setup.cfg

@@ -4,7 +4,7 @@ summary = Ansible Deployment of Kolla containers
 description-file =
     README.rst
 author = OpenStack
-author-email = openstack-dev@lists.openstack.org
+author-email = openstack-discuss@lists.openstack.org
 home-page = https://docs.openstack.org/kolla-ansible/latest/
 license = Apache License, Version 2.0
 classifier =