make GM self-test run gm/rebaseline_server unittests

gm/rebaseline_server/test_all.py

Index: gm/rebaseline_server/test_all.py
diff --git a/gm/rebaseline_server/test_all.py b/gm/rebaseline_server/test_all.py
index ba3d8fdbe0a11ddbc0168e313d63d278b95a290b..299d1340f23ec78664070d96510f81d296a3feb6 100755
--- a/gm/rebaseline_server/test_all.py
+++ b/gm/rebaseline_server/test_all.py
@@ -19,8 +19,10 @@ import unittest
 def main():
   suite = unittest.TestLoader().discover(os.path.dirname(__file__),
                                          pattern='*_test.py')
-  unittest.TextTestRunner(verbosity=2).run(suite)
-
+  results = unittest.TextTestRunner(verbosity=2).run(suite)
+  print repr(results)
+  if not results.wasSuccessful():
+    raise Exception('failed one or more unittests')
 
 if __name__ == '__main__':
   main()