Rewrite ‘with pkgs.lib’ -> ‘with lib’

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.

nixos/modules/services/networking/kippo.nix

@@ -6,8 +6,8 @@
 #      iptables -t nat -A PREROUTING -i IN_IFACE -p tcp --dport 22 -j REDIRECT --to-port 2222'';
 #
 # Lastly: use this service at your own risk. I am working on a way to run this inside a VM.
-{ pkgs, config, ... }:
-with pkgs.lib;
+{ config, lib, pkgs, ... }:
+with lib;
 let
   cfg = config.services.kippo;
 in