CBQE-0: Collect data files for xdcr upgrade failed tests

Change-Id: I93c84dd7aa6bb107584173521500a4a5fe5efd4c
Reviewed-on: http://review.couchbase.org/39232
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>