tests: Use (get|set)_prop

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>

tests/xmlparse.py

@@ -68,12 +68,12 @@ class XMLParseTest(unittest.TestCase):
         Check expected initial value obj.param == initval, then
         set newval, and make sure it is returned properly
         """
-        curval = getattr(obj, param)
+        curval = virtinst.xmlapi.get_prop(obj, param)
         self.assertEqual(initval, curval)
 
         for newval in args:
-            setattr(obj, param, newval)
-            curval = getattr(obj, param)
+            virtinst.xmlapi.set_prop(obj, param, newval)
+            curval = virtinst.xmlapi.get_prop(obj, param)
             self.assertEqual(newval, curval)
 
     def _make_checker(self, obj):