add result reporting for new realmd_join_sssd test
    
    Summary: this goes with D894, just adds result reporting, pretty simple.
    
    Test Plan:
    Generate results for a run of the new test, check they look
    good.
    
    Reviewers: garretraziel
    
    Reviewed By: garretraziel
    
    Subscribers: tflink
    
    Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D896