Thrift: Python test improvements.

Summary:
- Add a serialization test for forwards/backwards compatibility.
- Hook the Python tests up to "make check".
- Miscellaneous changes to the Python tests.

Reviewed By: mcslee

Test Plan: Ran the test.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665480 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/test/Makefile.am b/test/Makefile.am
index 1a95001..5fb3941 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -1,3 +1,5 @@
+SUBDIRS = py
+
 check_PROGRAMS = \
 	DebugProtoTest \
 	OptionalRequiredTest \