ipatests: test_ipahealthcheck: Verify permissions for /var/log/ files
    
    Test if files in /var/log are being checked with ipahealthcheck.ipa.files source.
    
    Resolves: https://pagure.io/freeipa/issue/8949
    
    Signed-off-by: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>