CBQE-0 fix collect log path on windows

Change-Id: I2a194a9bc2782913bcf5427dac9c8cd52276ae96
Reviewed-on: http://review.couchbase.org/43944
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>