Ticket #569 - examine replication code to reduce amount of stored state information
    
    Description: commit c7f6f161f4967635d6f02b029be571d88ec61961
    made this change:
      In case the deleted value list in an attribute is empty:
      * this means the entry is deleted and has no more attributes,
      * when writing the attr to disk we would loose the AD-csn.
      * Add an empty value to the set of deleted values. This will
      * never be seen by any client. It will never be moved to the
      * present values and is only used to preserve the AD-csn.
    The AD-csn size was not counted for the buffer size to allocate.
    This patch adds the size.
    
    https://fedorahosted.org/389/ticket/569
    
    Reviewed by Nathan (Thanks!!)
    
    (cherry picked from commit ca02529c797903139c56bd9b8b90e8cd5bd0c3f4)
    
    Conflicts:
    	ldap/servers/slapd/entry.c