CBQE-0: fix empty output for process running -windows

Change-Id: I21225e71cf6606c57642c19516efa711ec71436b
Reviewed-on: http://review.couchbase.org/31191
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>