move to different quay registry repo for non-production streams

[dustymabe]

The tag list in https://quay.io/repository/fedora/fedora-coreos?tab=tags&tag=latest is getting a little polluted with all the development/mechanical streams building daily. Maybe let's push the dev/mechanical streams to a new repo (quay.io/fedora/fedora-coreos-devel ??).

[dustymabe]

May be better to have a separate namespace for staging images. Something like quay.io/fedora-development.