CBQE-2141: Fix Failover Test Cases for Windows Environment

Change-Id: Ic19b870a8744e9e2bbe4b9b41c926f311eaea7a8
Reviewed-on: http://review.couchbase.org/34895
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>