MB-7497: Remove dirtiness from stored value

Change-Id: Ib6f7d139b55534c8402a090b33f812e23f0b0db2
Reviewed-on: http://review.couchbase.org/23754
Reviewed-by: Jin Lim <jin@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>