stream audit log to syslog

   New variable inroduced: audit_log_handler which takes values FLIE and SYSLOG.

   With FILE log handler plugin will log into file as it did before. With SYSLOG
   handler plugin will log with using syslog.

   Parameters audit_log_strategy, audit_log_buffer_size,
   audit_log_rotate_on_size, audit_log_rotations affect only FILE
   handler. Plugin doesn't perform any buffering and file rotations. It is
   delegated to syslog daemon.

   audit_log_flush with FILE handler writes closing sequence into file, reopens
   file and writes opening sequence. Flush normally used for manual log
   rotation. One can rename file and set audit_log_flush to TRUE which will
   cause completion of renamed file and creation of new one.

   With SYSLOG plugin does the same except that it does not actually do any log
   reopening, so you will only see closing and opening sequences in your log.

   To control syslog file handler following variables can be used:

   audit_log_syslog_ident, audit_log_syslog_facility, audit_log_syslog_priority
   They have the same meaning as appropriate parameters described in syslog(3)
   manual.