CBQE-0: remove data/cbcollectinfo files from collected location after
copying to given path

Change-Id: I34565001813bef64507eb96b517ecb768ea048d1
Reviewed-on: http://review.couchbase.org/36781
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>