CBQE-2523: run stale false queries during cluster ops

Change-Id: Id7c111347a37201172b4cf1ddf617c42f344e9bc
Reviewed-on: http://review.couchbase.org/44333
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>