Comment 3 for bug 1627000

I can't seem to reopen this, but I've had to propose a revert of this with https://review.openstack.org/388468 because it's going to break fedora & centos builds

Looking more closely, I think the above solution is wrong. grub2-tools should have been installed by the package-map.yaml file. Thus we should only need to install the grub2 package at final time.

I get the feeling that this is instack and maybe it's not doing the package-map installs? I think we'll need more logs to debug this further