* 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.


git-svn-id: 840f8e48daddc8dd68eb5e13d5019cb56db1b297@22299 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb

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