modules: Move vhosts.nix into config/ subdir.

Don't clutter up the top-level directory, as we're going to add more
modules in the "config" section.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Move Hydra to new machine "taalo".

We already had taalo back before the switch of benteflork to a new
machine, but now taalo is back and even stronger[TM] than before :-)

The main reason for moving the Hydra was that ultron doesn't have enough
disk space and also because I want services at ultron to be unaffected
of downtimes associated with the build farm.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
hydra: Add encrypted tunnel from ultron to taalo.

This is for the lighttpd proxy on /hydra to not send passwords in the
clear within the data centre.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
hydra: Use PostgreSQL 9.3 by default.

So, while we're moving Hydra and reimporting the database, it's a great
chance to switch over to the latest version.

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