execute it like ./test.sh 4 4000 testcase0.conf to obtain a successful execution

updating mock. It now wraps the calls to sync and reads config from configuration file.
I believe it's better not to use the preprocessor directive, i.e. not to put any test code in the engine_tcp. I just call the mock in the test_allreduce file. It's a file purely for testing purposes, so it's fine to use the mock there.

.gitignore

@@ -28,4 +28,4 @@
 *.app
 *~
 *.pyc
-test
+test_allreduce