CBQE-0: decrease the expires time for tests from 500 seconds to 30 sconds

Change-Id: Ifae4c9dbd3c39b2fff04b507360c4c59e8a5965d
Reviewed-on: http://review.couchbase.org/37498
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>