CBQE-0: fix AssertionError: global name 'time' is not defined

Change-Id: Idd501a38cab031a86177a929f439446c2337b667
Reviewed-on: http://review.couchbase.org/32860
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>