Revert "MB-9866 StoredValue now contains queued_item instance."

This reverts commit eb1cc91fd8299e61736030fe2faececdf66be3c6.

Change-Id: I7a1ab1a22dc108bf0c51791dc50dca04af46be4d
Reviewed-on: http://review.couchbase.org/33065
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung@couchbase.com>