Whenever I try to scan from another computer it has to establish >2
connections in order to succeed. With the connections being limited to 1
I can not scan any document.
This is also what other distributions ([Debian], [ArchLinux], …) have
done in one way or another.
[Debian]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850649#5
[ArchLinux]: no limit: 99cba454bb/trunk/saned.socket (L4)
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
