MB-100: extended 10k value size analysis

Change-Id: Ib81db12fe38df695dc81c1dfe64237eea0c9052d
Reviewed-on: http://review.couchbase.org/28406
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>