Following Noriko recommendation to update dblayer_private from ldbm_info
rather that updating directly the dblayer_private.
So this patch adds a new 'li' field: li_dblock, that is used to update
the dblayer_private->dblayer_lock_config
https://fedorahosted.org/389/ticket/48906
https://fedorahosted.org/389/attachment/ticket/48906/0004-Ticket-48906-Al...