Consider renaming BM to MNO

[akrzos]

Instead of referring to standard (3 control-plane, X worker nodes) and compact clusters as "Bare Metal" we should rename the terminology to MNO or Multi-Node OpenShift. This makes it simpler to understand since the two deployment playbooks with be MNO and SNO or Multi-Node OpenShift and Single Node OpenShift. Thus we should rename the bm-deploy playbook to mno-deploy. Considering this change will affect many folks, this needs to be communicated well before it is merged.