Move hostname settings to apb.yml & clean up apb.yml

[jasonmimick]

The hostname domain, token, and prefix setting should migrate from playbooks/provision.yaml into the main apb.yml.

Also - each plan has redundant settings in apb.yml, this is because I couldn't get the Ansible "aliases" to work. I wanted to have 3 different sections of parameters (ops mgr, cluster, then plan specific) and then include those each in the plan definition. But, couldn't get it to work right.