GitLab

With systemd it's easy to manage several instances of picomon (via templated
units) so this should be quite usefull.
Also we switch to /etc/picomon for config (instead of %prefix%/etc/picomon)
as /usr/local/etc don't seem to exist for real and that way it's not abnormal
to ship the unit in /etc too. Also it's easier to manage the config at only
one place (think about etckeeper etc.).

IPy is only used to get the version of an IP (4 or 6), but the IPs come
from reasonably trustable sources and if incorrect would at worse make
the test fail -- which is valid behavior.

So, no need for a real library to distinguish them, do a naive check
based on the presence of version-specific delimiters.