Change openstack-dev to openstack-discuss

Mailinglists have been updated. openstack-dev should be
replaced with openstack-discuss.

Change-Id: Icee252f9ad03436664b7f4591fdefc2a1648f99e

README.rst

@@ -47,8 +47,8 @@ External Resources:
 * Tacker Blueprints: https://blueprints.launchpad.net/tacker
 
 * For help on usage and hacking of Tacker, please send an email to
-  OpenStack-dev Mailing List <mailto:openstack-dev@lists.openstack.org> with
-  **[openstack-dev] [Tacker]** tag.
+  OpenStack-dev Mailing List <mailto:openstack-discuss@lists.openstack.org>
+  with **[openstack-dev] [Tacker]** tag.
 
 * To get release notes: `Tacker Release Notes
   <https://docs.openstack.org/releasenotes/tacker/>`_

setup.cfg

@@ -4,7 +4,7 @@ summary = OpenStack NFV Orchestration
 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/tacker/
 classifier =
     Environment :: OpenStack