feat(logging): add option to hide log line source

This is almost certainly going to be a footgun, but it's not too
bad of a change to make. If users really do want to make getting
support more difficult, so be it.

Closes: #1537
Signed-off-by: Xe Iaso <me@xeiaso.net>

cmd/anubis/main.go

@@ -276,7 +276,7 @@ func main() {
 
 	internal.SetHealth("anubis", healthv1.HealthCheckResponse_NOT_SERVING)
 
-	lg := internal.InitSlog(*slogLevel, os.Stderr)
+	lg := internal.InitSlog(*slogLevel, os.Stderr, false)
 	lg.Info("starting up Anubis")
 
 	if *healthcheck {