Fix --rev option for pure protobuf support

Change-Id: Ib66604c30159a73f96f529eea40fea329627132f
diff --git a/lib/xos-genx/tests/pure_proto_test.py b/lib/xos-genx/tests/pure_proto_test.py
index b7330d0..836b0b0 100644
--- a/lib/xos-genx/tests/pure_proto_test.py
+++ b/lib/xos-genx/tests/pure_proto_test.py
@@ -5,8 +5,7 @@
 
 # Generate from xproto, then generate from equivalent proto
 class XPureProtobufGenerator(unittest.TestCase):
-	#FIXME this test is failinf
-    def _test_pure_proto(self):
+    def test_pure_proto(self):
 		xproto = \
 """
 message VRouterPort (XOSBase){