CBQE-0: fix cas test

Change-Id: I528a067a1d71d99d3b64828fea39ea86b7f274d4
Reviewed-on: http://review.couchbase.org/29894
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>