* During shutdown, don't unmount mount points that don't exist (in the   current namespace).  This prevents warnings about the aufs/tmpfs   mounts from the initrd used by the installation CD.
* During shutdown, don't unmount mount points that don't exist (in the
  current namespace).  This prevents warnings about the aufs/tmpfs
  mounts from the initrd used by the installation CD.

svn path=/nixos/branches/boot-order/; revision=22299

rbvermaa/nixos-svn,SymbiFlow/nixpkgs,NixOS/nixpkgs,andreassalomonsson/nixos,NixOS/nixos,NixOS/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,SymbiFlow/nixpkgs,andreassalomonsson/nixos,andreassalomonsson/nixos,NixOS/nixos,triton/triton,edolstra/nixos,NixOS/nixpkgs,andreassalomonsson/nixos,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,triton/triton,SymbiFlow/nixpkgs,triton/triton,NixOS/nixos,NixOS/nixos,andreassalomonsson/nixos,NixOS/nixos,SymbiFlow/nixpkgs,edolstra/nixos,NixOS/nixpkgs,NixOS/nixpkgs,triton/triton,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,edolstra/nixos,NixOS/nixpkgs,edolstra/nixos,andreassalomonsson/nixos,NixOS/nixpkgs,rbvermaa/nixos-svn,rbvermaa/nixos-svn,SymbiFlow/nixpkgs,rbvermaa/nixos-svn,triton/triton,SymbiFlow/nixpkgs,edolstra/nixos,triton/triton,NixOS/nixos