Revert "MB-10164: log reasons for the shard count choice"

This reverts commit 1028c55fddec0c354e47f45972453cc23ddf1696.

Change-Id: Ieac87e3dd3035f9a2b14ec4084742901359ca9e5
Reviewed-on: http://review.couchbase.org/34905
Reviewed-by: abhinav dangeti <abhinav@couchbase.com>
Tested-by: abhinav dangeti <abhinav@couchbase.com>