Retire project

Leave README around for those that follow.

http://lists.openstack.org/pipermail/openstack-discuss/2019-February/003186.html
http://lists.openstack.org/pipermail/openstack-discuss/2018-November/000057.html

Change-Id: Ida556725f9f44268a7b124bc239fa6bcde8a1c2e

.zuul.yaml

@@ -0,0 +1,3 @@
+- project:
+    templates:
+      - noop-jobs

README.md

@@ -0,0 +1,6 @@
+This project is no longer maintained.
+
+The contents of this repository are still available in the Git
+source code management system.  To see the contents of this
+repository before it reached its end of life, please check out the
+previous commit with "git checkout HEAD^1".