Add release-notes-jobs-neutron
Add release-notes-jobs-neutron

This patch is adding the release-notes-jobs-neutron job for the neutron
stadium projects which currently needs to have openstack/neutron
explicity set to their "required-projects".

Change-Id: Ibf6c4c268fecd8ef0bd0bb234abac3d2e3b20278

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs