* Fix "error: the group `nixbld' specified in `build-users-group' does   not exist" during nixos-install.
* Fix "error: the group `nixbld' specified in `build-users-group' does
  not exist" during nixos-install.


git-svn-id: 71c8032c709790ec749031c4215f8515ac00dc5a@34103 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb

bnordgren/nixos,bnordgren/nixos,bnordgren/nixos,bnordgren/nixos,bnordgren/nixos