CBQE-0: fix FailoverBaseTest.setUp

Change-Id: I45a44333ae2548c4abdae4a0d444a76c391bed6c
Reviewed-on: http://review.couchbase.org/28366
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>