Extract service and ansible playbook information from talk article

[Fryguy]

See https://talk.manageiq.org/t/passing-data-between-ansible-playbooks-in-a-state-machine/4842 and https://talk.manageiq.org/t/introducing-service-vars-for-service-provisioning/4850 . @tinaafitz had a great write-up of some automate/ansible interactions, and we should extract it into the documentation proper.

[miq-bot]

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