Integrate monitoring into production

Closes privatestorageops#347, privatestorageops#271, privatestorageops#301, privatestorageops#293, #29, and #30

See merge request !91

Tweaks to storage003's configuration to reflect new reality

Closes privatestorageops#310

See merge request !106

Also change the `domain` parameter for Grafana to always
use that beautiful name - besides display it's cosmetic anyway
IIANM so I'll not parametrize it for now.

Else the script will fail if the links are already there and not
rotate the preshared.key.

Also now write out a new preshared.key before creating the links
just in case that flag gets lost again.

use nix to extra values from our nix config

See merge request !105

Integrate monitoring into staging

Closes privatestorageops#346

See merge request !89

Remove storage000 files from production grid

See merge request !104

Integrate monitoring into local grid

Closes privatestorageops#344

See merge request !88

See https://whetstone.privatestorage.io/privatestorage/PrivateStorageio/-/merge_requests/103#note_13854

Make VirtualBox a lighter build

See merge request !102

Remove the VirtualBox GUI, see
https://search.nixos.org/options?channel=21.05&show=virtualisation.virtualbox.host.headless&from=0&size=50&sort=relevance&query=virtualbox

Update PaymentServer

See merge request !99

868bdea18361a0ca78ef8343018354232747de36 got rid of "tahoe-lafs"

19dd3895d4e7bd5d6205c0eebaba1c843c871e37 added "tahoe-lafs-1_14" and
"tahoe-lafs-master".

8c7a61c658e32eaccf666e5fe818a996c36a988f explicitly uses 1_14 for privatestorage.

* Merge pull request #79 from PrivateStorageio/78.tests-in-nix-packaging
* Merge pull request #80 from PrivateStorageio/77.payment-metadata-handling
* Merge pull request #83 from PrivateStorageio/82.currency-parsing
* Merge pull request #85 from PrivateStorageio/84.currency-and-price

Add monitoring VPN modules and config

Closes privatestorageops#341

See merge request !87