CBD-1400:  move windows package to WORKSPACE root so that jenkins job can find it more easily

Change-Id: I215194908d56849f5771d8e8b3a454af5df3d041
Reviewed-on: http://review.couchbase.org/39175
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>