add FreeIPA test disks (with kickstarts) and update InstallGuide
    
    Summary:
    This goes along with the openqa_fedora commit to add the tests.
    I didn't update the Docker instructions yet because I don't
    quite remember how that goes. It might need a whole different
    setup using some other networking...thing...
    
    Test Plan: See https://phab.qadevel.cloud.fedoraproject.org/D831
    
    Reviewers: jskladan, garretraziel
    
    Reviewed By: garretraziel
    
    Subscribers: tflink
    
    Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D832