MB-9236: Fix test

The error message changed, update the test accordingly

Change-Id: I92451b55a05a2f382b99e92a59dbb64834c86550
Reviewed-on: http://review.couchbase.org/29392
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>