Support for syslog (MariaDB 10.3 & Ubuntu 18.04)

[MartinStepar]

There is no error log file on fresh installation of MariaDB 10.3 on Ubuntu Server 18.04. Syslog is used instead. Is possible to add support for syslog?

Current status:

-------- Log file Recommendations ------------------------------------------------------------------
[--] Log file: /var/lib/mysql/manitu.err(0B)
[!!] Log file /var/lib/mysql/manitu.err doesn't exist
[!!] Log file /var/lib/mysql/manitu.err isn't readable.

All logged messages can be found with command cat /var/log/syslog | grep "mysqld"

[grooverdan]

#539 is a protoype around log improvements. It provides systemd journal reading. syslog output could end up anywhere according to syslog user configuration so this wasn't implemented. Is this useful enough? Suggested enhancements?