Add zuul_version to status.json samples

Change-Id: I6de5ddda6597585944739e5b3dff8c8f86930b1d
diff --git a/etc/status/public_html/status-openstack.json-sample b/etc/status/public_html/status-openstack.json-sample
index 8012420..41c231a 100644
--- a/etc/status/public_html/status-openstack.json-sample
+++ b/etc/status/public_html/status-openstack.json-sample
@@ -307,5 +307,6 @@
     },
     "result_event_queue": {
         "length": 0
-    }
+    },
+    "zuul_version": "2.0.0.19"
 }