Python: Fix property access with director

Examples/test-suite/python/director_property_runme.py

@@ -0,0 +1,18 @@
+import director_property
+
+class PyFoo(director_property.Foo):
+	a = property(director_property.Foo.getA, director_property.Foo.setA)
+
+	def ping(self):
+		return "PyFoo::ping()"
+
+
+foo = PyFoo()
+
+foo.setA("BLABLA")
+if foo.getA() != "BLABLA":
+	raise RuntimeError
+
+foo.a = "BIBI"
+if foo.a != "BIBI":
+	raise RuntimeError