Change openstack-dev to openstack-discuss

Mailing lists have been updated. Openstack-discuss replaces openstack-dev.

Change-Id: Ida7769da4699da3e25329f21924839211b0f93d1

setup.cfg

@@ -4,7 +4,7 @@ summary = Kuryr shared config and utilities
 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/kuryr/latest/
 classifier =
     Environment :: OpenStack