CBQE-0: Very Initial design draft of xdcrnewbasetests.py

Change-Id: I6f0e9121d6565d50b650e3cc324feb66b7783b25
Reviewed-on: http://review.couchbase.org/41483
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>