Ticket #71 - unable to delete managed entry config
    
    https://fedorahosted.org/389/ticket/71
    
    Bug Description:  Trying to delete a managed entry config entry using ldapmodify
     		  resulted in an error 53 becuase the code did not handle delete
    		  operations.
    Fix Description:  Just check for the delete operation, and skip to the end.  The
                      Post op function handles the delete automatically since it reloads
    		  the cache from the real config.
    
    		  I also converted all the char dn's to Slapi_DN's