Update metaSize and on-disk nodeSize upon an update of node's meta
Update metaSize and on-disk nodeSize upon an update of node's meta

- We should update both metaSize and nodeSize properly when a node's
meta data is changed.

Change-Id: I654296c90083230a6893ce0a720ef275ca93fc2b
Reviewed-on: http://review.couchbase.org/69338
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>

couchbase/forestdb,wurikiji/forestdb,wurikiji/forestdb,couchbase/forestdb