CBQE-0: fix setup in warmuptest

Change-Id: I668e3de7ebb44163673c6c2178925d84bc0338f8
Reviewed-on: http://review.couchbase.org/34888
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>