CBQE-0 kill any bash.exe in windows

Change-Id: Id4098a43f6b8f967b9ae21002f82d7abd8471f3b
Reviewed-on: http://review.couchbase.org/40198
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>