Issue description

#47684 added a pkgs argument which is not passed in nixops: https://github.com/NixOS/nixops/blob/master/nix/eval-machine-info.nix#L9

This results in the following failure:

error: anonymous function at /home/joerg/git/nixpkgs/nixos/lib/testing.nix:1:1 called without required argument 'pkgs', at /home/joerg/git/nixops/nix/eval-machine-info.nix:9:6
error: evaluation of the deployment specification failed

Steps to reproduce

$ nixops deploy -d <any-deployment>

Technical details

• system: "x86_64-linux"
• host os: Linux 4.14.80, NixOS, 19.03.git.b43a02a (Koi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.1.3
• channels(root): "nur"
• channels(joerg): "home-manager"
• nixpkgs: /home/joerg/git/nixpkgs