[CentOS-devel] Migrating https://github.com/cgwalters/centos-release-atomic-host-devel into CentOS namespace

Hi,

I'm working on a "devel/continuous" Atomic Host stream[1] and we were pulling in `centos-release` via deps which I think is wrong.  Also, I needed to fix a bug[2].

Can we migrate:
https://github.com/cgwalters/centos-release-atomic-host-devel
into the CentOS namespace?  I don't mind carrying it in projectatomic/ though
either, but it feels more at home in CentOS.

[1] https://wiki.centos.org/SpecialInterestGroup/Atomic/Devel
[2] https://github.com/rpm-software-management/libhif/pull/137