b/c we've migrated to Upshift we must use different instance type,
specify the desired network to connect to and update how we get
the ip address of the launched VM.
Related: rhbz#1653934
Related: rhbz#1653934
note: for now use Fedora 28 for the Docker container until
CentOS 8 is released or we figure out how to use subscriptions
for official RHEL 8 images.
