CBQE-0: script to collect data files from every node

Change-Id: I2107e18f42997f4ab8adf2ef62593f657b9d7bf4
Reviewed-on: http://review.couchbase.org/34749
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>