Migrate from facility to metro lingo

[mweinelt]

The Equinix Metal API has deprecated¹ use of the facility² keyword back in 2023-05 and now after 2024-03-31 it will be removed.

It has been replaced by the metro³ keyword, that serves a same purpose.

The "any" metro can be used to set no restriction on instance creation.

[1] https://feedback.equinixmetal.com/changelog/bye-facilities-hello-again-metros
[2] https://deploy.equinix.com/developers/docs/metal/locations/facilities/
[3] https://deploy.equinix.com/developers/docs/metal/locations/metros/

[mweinelt]

Apparently facility is still a required field on the create device API.

systemd[1]: Started hydra-scale-equinix-metal.service.
scale[2756758]: Work summary:
scale[2756758]: System("aarch64-linux") BigParallel = 22
scale[2756758]: System("aarch64-linux") Small = 0
scale[2756758]: System("x86_64-linux") BigParallel = 25
scale[2756758]: System("x86_64-linux") Small = 5803
scale[2756758]: WARNING: System("aarch64-linux")/BigParallel has no hardwarecategory in the hardware map
scale[2756758]: WARNING: System("aarch64-linux")/Small has no hardwarecategory in the hardware map
scale[2756758]: Creating: HardwarePlan {
scale[2756758]:     bid: 2.0,
scale[2756758]:     plan: "c3.medium.x86",
scale[2756758]:     netboot_url: "https://netboot.nixos.org/dispatch/hydra/hydra.nixos.org/equinix-metal-builders/main/c3-medium-x86--big-parallel",
scale[2756758]: }
scale[2756758]: Error: failed to parse json, here's the raw content: Object {
scale[2756758]:     "errors": Array [
scale[2756758]:         String("You must specify a valid facility parameter"),
scale[2756758]:     ],
scale[2756758]: }
scale[2756758]: Caused by:
scale[2756758]:     missing field `hostname` at line 1 column 58
scale[2756758]: Location:
scale[2756758]:     src/device.rs:92:10
systemd[1]: hydra-scale-equinix-metal.service: Main process exited, code=exited, status=1/FAILURE