Add an OpenStack test

This is a temporary test to experiment with how we might use Zuulv3
features to organize testing for OpenStack.

It doesn't do anything interesting yet.

Change-Id: I852feeff7f28be3dc408c96df06cb8f919b13c75
diff --git a/tests/fixtures/config/openstack/main.yaml b/tests/fixtures/config/openstack/main.yaml
new file mode 100644
index 0000000..95a0952
--- /dev/null
+++ b/tests/fixtures/config/openstack/main.yaml
@@ -0,0 +1,6 @@
+- tenant:
+    name: openstack
+    source:
+      gerrit:
+        config-repos:
+          - project-config