Query for server role IPA master
    
    server_find and server_role plugin were hiding IPA master role
    information. It's now possible to fetch IPA master role information and
    to filter by IPA master role, e.g. to ignore servers that have some
    services configured but not (yet) enabled.
    
    See: https://pagure.io/freeipa/issue/7566
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>