Ticket 48978 - Convert slapi_log_error() to a variadic macro
    
    Description:  In order to replace the LDAPDebug() logging functions with
                  slapi_log_error() we need make slapi_log_error behave as the
                  LDAPDebug() marco does.  The benefit of having the logging
                  function macro is that you can completely remove the presence
                  of error logging.  This is very beneficial when investigating
                  a performance issue.
    
    https://fedorahosted.org/389/ticket/48978
    
    Reviewed by: nhosoi(Thanks!)