[bootkit] purpose of func metaDataQuery and container_uuid

[jacobweinstock]

Anyone know any context/purpose for the metaDataQuery function? It looks like it queries the metadata server (hegel) and just pulls out the id field. Then uses this value as an env var container_uuid when starting the Tink-worker. A quick grep of the Tink code bases doesn't come up with any references to this container_uuid field.

Also, it looks like this id string is the same as the WORKER_ID in /proc/cmdline. This feels like something that could potentially be removed entirely from bootkit?

CC @thebsdbox

This is from the sandbox:
"id": "0eba0bf8-3772-4b4a-ab9f-6ebe93b90a94"
worker_id=0eba0bf8-3772-4b4a-ab9f-6ebe93b90a94

metadata (formatted for readability)

{
    "id": "0eba0bf8-3772-4b4a-ab9f-6ebe93b90a94",
    "metadata": {
        "facility": {
            "facility_code": "onprem",
            "plan_slug": "c2.medium.x86",
            "plan_version_slug": ""
        },
        "instance": {},
        "state": "provisioning"
    },
    "network": {
        "interfaces": [
            {
                "dhcp": {
                    "arch": "x86_64",
                    "ip": {
                        "address": "192.168.56.43",
                        "netmask": "255.255.255.0"
                    },
                    "mac": "08:00:27:9e:f5:3a"
                },
                "netboot": {
                    "allow_pxe": true,
                    "allow_workflow": true
                }
            }
        ]
    }
}

/proc/cmdline (formatted for readability)

ip=dhcp
modules=loop,squashfs,sd-mod,usb-storage
alpine_repo=http://192.168.56.4:8080/misc/osie/current/repo-x86_64/main
modloop=http://192.168.56.4:8080/misc/osie/current/modloop-x86_64
tinkerbell=http://192.168.56.4
syslog_host=192.168.56.4
parch=x86_64
packet_action=workflow
packet_state=provisioning
docker_registry=192.168.56.4
grpc_authority=192.168.56.4:42113
grpc_cert_url=http://192.168.56.4:42114/cert
instance_id=
registry_username=admin
registry_password=Admin1234
packet_base_url=http://192.168.56.4:8080/workflow
worker_id=0eba0bf8-3772-4b4a-ab9f-6ebe93b90a94
packet_bootdev_mac=08:00:27:9e:f5:3a
facility=onprem
plan=c2.medium.x86
manufacturer=
slug=
initrd=initramfs-x86_64
console=tty0
console=ttyS1,115200