PYCBC-117: Make conncache test work on Windows

Change-Id: I9030106885a1a563642e2cb0e34d73e600a4f1c9
Reviewed-on: http://review.couchbase.org/26379
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: Mordechai Nunberg <mnunberg@haskalah.org>