Add nodepool-zuul-functional as non-voting check job

This test was fixed with I3d064e6c1df02f1dad2a08855927703a0e23a047;
let's run it

Depends-On: https://review.openstack.org/545158
Change-Id: I4a6809136fc92ff485e7969e6ed59f8dda50c05c
diff --git a/.zuul.yaml b/.zuul.yaml
index caef296..8b5ccb9 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -44,6 +44,8 @@
               - zuul/cmd/migrate.py
               - playbooks/zuul-migrate/.*
         - zuul-stream-functional
+        - nodepool-zuul-functional:
+            voting: false
     gate:
       jobs:
         - build-sphinx-docs: