Unitfile for multiple instance and systemd for the powerdns-recursor

[j0ju]

From a small discussion on IRC.
The following first version of a unit file supporting multiple instances has emerged https://gist.github.com/pieterlexis/9ca263d1d900f56e9661da9d2b705f8a.

Please include it in future releases.

[j0ju]

This unit file works, but logging is a bit globbered, the timestamp is added twice when loggin via systemd/journald.

Jun 2 15:22:20 host pdns_recursor[21012]: Jun 02 15:22:20 Refreshed . records

It might be a good idea, adding an option for not adding a timestamp prefix when logging to stdout under a supervisor.

[pieterlexis]

yes, this is also the case with the auth I think.... We'll need to ponder to just stop timestamping ourselves or make it configurable.

[j0ju]

An option would be better IMHO, as for debugging running pdns on foreground on a console should log timestamps.