Add cerify and verify playbooks

[steven-schattenberg-itential]

This change adds:

• A playbook to verify that the servers are suitable for installation.
• A playbook to certify an installation that has occurred.
  • An associated set of tasks to perform the certification, one per component
  • A template to aggregate the certification results

This change also replaces the old preflight role and removes those files.

[kvelarde-itential]

I think there are still some playbook/role structure issues. Let's discuss on a call.