Remove branch-specific templates from .zuul.yaml
Remove branch-specific templates from .zuul.yaml

I jumped the gun a bit here, and it turns out that all branch-specific
jobs will be maintained in openstack-infra/project-config, and not moved
to project repos.

Change-Id: Ia54bd7d29717e2fb025c9547b852c4ec00cbcbd2

noironetworks/heat,openstack/heat,noironetworks/heat,openstack/heat