* Quick hack to prevent the system from hanging in halt/reboot: force

NFS unmounts.  We have to do this because networking is already down
  by the time we get to the unmounting.  It would be better to unmount
  all remote file systems when an ip-down event occurs.

svn path=/nixos/trunk/; revision=7620

upstart-jobs/halt.nix

@@ -47,7 +47,7 @@ script
         for mp in $(getMountPoints); do
             device=$(getDevice $mp)
             echo \"unmounting $mp...\"
-            if umount -n \"$mp\"; then
+            if umount -f -n \"$mp\"; then
                 if test \"$mp\" != /; then tryAgain=1; fi
             else
                 mount -n -o remount,ro \"$mp\"