CBQE-1069: fix wind upgrade from version >1.8.1

Change-Id: I2e0f480b33a8854aa2a084c17c3fde8b4933f1cf
Reviewed-on: http://review.couchbase.org/25076
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>