Add a python script to test the simple corner cases of MVCC.
Add a python script to test the simple corner cases of MVCC.


Former-commit-id: 69ee296792394c964e2eaa583eb9aa5c848bafb2
omegaga/peloton,larryxiao/peloton-1,ranxian/peloton,larryxiao/peloton-1,omegaga/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton-1,larryxiao/peloton-1,omegaga/peloton,ranxian/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,larryxiao/peloton,larryxiao/peloton-1,omegaga/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,larryxiao/peloton-1,omegaga/peloton,ranxian/peloton,ranxian/peloton,omegaga/peloton,ranxian/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton-1,larryxiao/peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,larryxiao/peloton,ranxian/peloton,larryxiao/peloton,omegaga/peloton,amaliujia/CMUDB-peloton,larryxiao/peloton