Rename default playbook?

[etsauer]

I feel like in the context of a repo dedicated to openshift-applier, the name of the default playbook we use playbooks/openshift-cluster-seed.yml is awkward. I think we need to come up with a new convention for the playbooks/ folder, allowing for shorter names and multiple playbooks of various flavors.

To that, I would propose the following change:

mv playbooks/openshift-cluster-seed.yml playbooks/simple.yml
sed -i 's/hosts: seed-hosts/hosts: applier-hosts/' playbooks/simple.yml

[oybed]

I'm ok with finding a new name for the "default playbook" (and v2.x is good timing for this), but not sure simple is the best name for it. I don't have a better suggestion as-is, but I'll think about something.