… derivations to new pullImage function signature

Motivation for this change

Hi,
I tried to run kubernetes on my nixos/unstable system. Unfortunately nix refused to build kube-dns and kube-dashboard. It looks like this is caused by a change in the function signature of pkgs/build-tools/docker/default.nix:pullImage. This patch tries to fix that.

I tested the module on my local system, but unfortunately the nixos tests for kubernetes are not "working" for other reasons I do not understand quite right. However, the build failure does not occur anymore with this patch and the problems arise for me at runtime and seem -- as far as I understand -- not related to the thing this patch tries fix.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.