tests: tracker: Split Tracker into one-purpose Trackers
    
    There are multiple types of entries and objects accessible in API and not all
    of them have the same set methods. Spliting Tracker into multiple trackers
    should reflect this better.
    
    https://pagure.io/freeipa/issue/7105
    
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>