Remove intree jobs for openstack/windmill
These can now be deleted as we've move them into openstack/windmill.
Depends-On:
name: openstack/windmill
templates:
- system-required
- - ansible-role-jobs
- docs-on-readthedocs
- - windmill-jobs-centos7-nv
- - windmill-jobs-fedora-26
- - windmill-jobs-xenial
- project:
name: openstack/workload-ref-archs
