Ticket #111 - ability to control behavior of modifyTimestamp/modifiersName
    
    Bug Description:  Currently, the modifiersname/creatorsname is set to the plugin name,
                      if the plugin performed the add or modification.  There is no way to
                      track the original bind dn that trigger the update.
    
    Fix Description:  Added a new config setting(nsslapd-plugin-binddn-tracking) that will
                      update a set of new operational attributes:
    
                          internalModifiersname & internalCreatorsname
    
                      These attributes will store the plugin dn that made the update, while
                      modifiersname/creatorsname will now be the bind dn that initiated the
                      operation.
    
    https://fedorahosted.org/389/ticket/111
    
    Reviewed by: richm (Thanks Rich!)