CBQE-1199: review maxBucketCount

Change-Id: Ie8a174416644a641fc29031babaa978d2414ad51
Reviewed-on: http://review.couchbase.org/36990
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>