LiveTest: flush stdout when printing output

(cherry picked from commit bafc3a93)

product/ERP5Type/tests/ERP5TypeLiveTestCase.py

@@ -223,6 +223,7 @@ def runLiveTest(test_list, verbosity=1, stream=None, **kw):
     output = StringIO()
   def print_and_write(data):
     sys.stdout.write(data)
+    sys.stdout.flush()
     return StringIO.write(output, data)
   output.write = print_and_write
   output.write("**Running Live Test:\n")