migrate: cli vminfo

[NemoDacremont]

Changes

Add get vminfo to the new cli, I had to add NewVmRefFromApi in order to properly get the guest information from API only with the Id.

list of changes :

• Add get vminfo to the new cli
• Add sdk.NewVmRefFromApi to create a new VmRef with all information from API only with the VmId

Test

This changes can be tested by creating a vm and then retrieving the info with proxmox-api-go get vminfo <id>, here is a snippet that should do the work :

cat << EOF > qemu.json
{
    "name": "test-qemu01",
    "bios": "seabios",
    "tablet": true,
    "memory": {
        "capacity": 2048
    },
    "ostype": "l26",
    "sockets": 1,
    "cpu": {
        "type": "host",
        "cores": 1
    },
    "numa": false,
    "kvm": true,
    "hotplug": "network,disk,usb",
    "boot": "order=ide2;net0",
    "scsihw": "virtio-scsi-pci",
    "network": {
        "0": {
            "bridge": "vmbr0",
            "firewall": true,
            "id": 0,
            "macaddr": "B6:8F:9D:7C:8F:BC",
            "model": "virtio"
        }
    }
}
EOF
NEW_CLI=true ./proxmox-api-go -i create guest qemu -f qemu.json 123 pve
NEW_CLI=true ./proxmox-api-go -i get vminfo 123

It should show :

{
  "id": 123,
  "node": "pve",
  "bios": "seabios",
  "boot": "order=ide2;net0",
  "cpu": {
    "cores": 1,
    "type": "host"
  },
  "description": "",
  "hotplug": "network,disk,usb",
  "memory": {
    "capacity": 2048
  },
  "name": "test-qemu01",
  "protection": false,
  "kvm": true,
  "ostype": "l26",
  "scsihw": "virtio-scsi-pci",
  "smbios1": "uuid=4cad0e7e-046b-4776-aa8d-9985e295f1b0",
  "tablet": true
}

fixes #513

[NemoDacremont]

I realized I could use client.CheckVmRef to populate the VmRef with missing data. tbh I don't like the naming, but it's better like that to prevent too much code duplication