Update contact address to openstack-discuss ML

The openstack-dev mailing list has been retired and its
conversations now take place on openstack-discuss instead.

http://lists.openstack.org/pipermail/openstack-dev/2018-November/136501.html

Update this cookiecutter so that new projects don't copy over the
obsolete ML name.

Change-Id: I720a4c93e2c004814e4dd8815acef784098f4fc6

{{cookiecutter.repo_name}}/package.json

@@ -8,7 +8,7 @@
   "version": "0.0.0",
   "private": true,
   "license": "Apache 2.0",
-  "author": "Openstack <openstack-dev@lists.openstack.org>",
+  "author": "Openstack <openstack-discuss@lists.openstack.org>",
   "devDependencies": {
     "eslint": "3.19.x",
     "eslint-config-openstack": "^4.0.1",

{{cookiecutter.repo_name}}/setup.cfg

@@ -4,7 +4,7 @@ summary = {{ cookiecutter.project_short_description }}
 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