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

... if you are reading this not in the repo, but from the web page, you might
not know where to go to make all those nice commands work.

The testing grid is missing users.nix but the local grid has it.

Disable agent forwarding

Closes #59

See merge request !98

Put the original domain first

See merge request !95

The original domain got some state created for it by certbot.  The
certificates are anchored to `payments.privatestorage.io` in the filesystem.
The code handling these domains uses the first domain name in the list to find
the certificates, so make it match the filesystem state.