Ticket #360 - ldapmodify returns Operations error - fix delete caching
    
    https://fedorahosted.org/389/ticket/360
    Resolves: Ticket #360
    Bug Description: ldapmodify returns Operations error - fix delete caching
    Reviewed by: nhosoi (Thanks!)
    Branch: master
    Fix Description: Since creating a tombstone uses the same entryid as the
    original entry to be deleted, we have to use cache_replace to replace the
    existing entry with the tombstone.  This is similar to modify and modrdn.
    Platforms tested: RHEL6 x86_64, Fedora 17
    Flag Day: no
    Doc impact: no