Change openstack-dev to openstack-discuss

Mailinglists have been updated.
So, replacing openstack-dev to openstack-discuss

Change-Id: I8cf824d252a2bd3f5640c710dc343535cab771e3
diff --git a/setup.cfg b/setup.cfg
index bab1c71..21fd965 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,7 +4,7 @@
 description-file =
     README.rst
 author = OpenStack
-author-email = openstack-dev@lists.openstack.org
+author-email = openstack-discuss@lists.openstack.org
 home-page = http://www.openstack.org/
 classifier =
     Environment :: OpenStack