Add support for a syslog server

[martin-green]

Syslog is a simple protocol that transfer log-text over the network.
It is using UDP port 514 (default).
The message format is a string with a header:
<#> text
Where the # a number 1-3 digits that consist of the facility and level.
See rfc: https://tools.ietf.org/html/rfc5426