Fix to the compilation issue in ep_testsuite

Change-Id: I6071fcf7af55a2a0ff91c86e084c114e42ea20d5
Reviewed-on: http://review.couchbase.org/33850
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung@couchbase.com>