danbst f7940bb95d nixos/containers: give a name to an anonymous container module
See https://github.com/NixOS/nixpkgs/issues/15747. Previously this module was called `<unknown-file>`
in error messages, now it is called a bit more close to real:
```
module at /home/danbst/dev/nixpkgs/nixos/modules/virtualisation/containers.nix:470
```
2019-06-05 03:11:09 +03:00
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