Comment 2 for bug 1604039

This is a mixup between spec and source branches, rpm-mitaka branch works with stable/mitaka.
I was looking at scripts/tripleo.sh and suspect is this part:
https://github.com/openstack-infra/tripleo-ci/blob/master/scripts/tripleo.sh#L351-L356
where local branches in the source checkout are reset to master HEAD and from the git history I don't understand why is that.