Gate on zuul-stream-functional

Change-Id: I319fec86b7002bf7926b835031ea97e097981326
diff --git a/.zuul.yaml b/.zuul.yaml
index 8522507..80028fb 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -43,6 +43,7 @@
         - tox-docs
         - tox-pep8
         - tox-py35
+        - zuul-stream-functional
     post:
       jobs:
         - publish-openstack-python-docs-infra: