CBQE-0: cbstat test fix

Change-Id: I50feb94aa8f25e7330a982bfb09df2278aed1cd1
Reviewed-on: http://review.couchbase.org/28247
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>