make-disk-image: change to be less VM-centric

This changes much of the make-disk-image.nix logic (and thus most NixOS
image building) to use LKL to set up the target directory structure rather
than a Linux VM. The only work we still do in a VM is less IO-heavy stuff
that while still time-consuming, is less of the overall load. The goal is
to kill more of that stuff, but that will require deeper changes to NixOS
activation scripts and switch-to-configuration.pl, and I don't want to
bite off too much at once.

nixos/maintainers/scripts/ec2/amazon-image.nix

@@ -6,10 +6,7 @@ let
   cfg = config.amazonImage;
 in {
 
-  imports =
-    [ ../../../modules/installer/cd-dvd/channel.nix
-      ../../../modules/virtualisation/amazon-image.nix
-    ];
+  imports = [ ../../../modules/virtualisation/amazon-image.nix ];
 
   options.amazonImage = {
     contents = mkOption {