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
1 file changed