Open Stack

Greetings,

We've had fedora-28 nodes online for some time in openstack-infra, I'd like to
finish the migration process and remove fedora-27 images.

Please take a moment to review and approve the following patches[1]. We'll be
using the fedora-latest nodeset now, which make is a little easier for
openstack-infra to migrate to newer versions of fedora.  Next time around, we'll
send out an email to the ML once fedora-29 is online to give projects some time
to test before we make the change.

Thanks
- Paul

[1] https://review.openstack.org/#/q/topic:fedora-latest