snoopy should now support systemd-aware logging

[jimklimov]

FYI: Based on our old suggestion to snoopy, there was recent progress with issue a2o/snoopy#200 so their current git master should be more functional for logging systemd units.

It would be helpful to spin an experimental branch to check if it works and solves 42ity dev/test logging more neatly than it was addressed before, and tell the snoopy team if this feature is good.