nixos: Give virtualbox-host.nix a better location.

In 14f09e0, I've introduced the module under modules/programs, because
the legacy virtualbox.nix was also under that path. But because we
already have modules/virtualisation/virtualbox-guest.nix, it really
makes sense to put this module alongside of it as well.

This module thus has no change in functionality and I've tested
evaluation against nixos/tests/virtualbox.nix and the manual.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

aszlig 6c507142 878e69c6

Changed files
+1 -1
nixos
modules
+1 -1
nixos/modules/module-list.nix
···
./programs/ssmtp.nix
./programs/uim.nix
./programs/venus.nix
-
./programs/virtualbox-host.nix
./programs/wvdial.nix
./programs/freetds.nix
./programs/zsh/zsh.nix
···
./virtualisation/openvswitch.nix
./virtualisation/parallels-guest.nix
./virtualisation/virtualbox-guest.nix
./virtualisation/vmware-guest.nix
./virtualisation/xen-dom0.nix
]
···
./programs/ssmtp.nix
./programs/uim.nix
./programs/venus.nix
./programs/wvdial.nix
./programs/freetds.nix
./programs/zsh/zsh.nix
···
./virtualisation/openvswitch.nix
./virtualisation/parallels-guest.nix
./virtualisation/virtualbox-guest.nix
+
./virtualisation/virtualbox-host.nix
./virtualisation/vmware-guest.nix
./virtualisation/xen-dom0.nix
]
nixos/modules/programs/virtualbox-host.nix nixos/modules/virtualisation/virtualbox-host.nix